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Username Post: AT behind an inline 6?        (Topic#347963)
gregmaz 
Silver Supporting Member
Posts: 156
gregmaz
Reg: 05-10-10
10-30-17 12:10 PM - Post#2712719    

Bought a $100 3spd to replace the OEM 3 spd "peanut".
Major crack on the shaft...

So AT we go, might as well get some comfort. But what will work and for how much?

Got a 10 inch plate and a 4 bolts housing.

Not thinking fancy, just easy build.



67 C10 6 inline 4.1l (250) Rochester B
8ft
limited slip 12 bolts
3 on the "peanut" tree

I drive for a living


 
bobschevytrucks.com Ecklers

raycow 
Honored Member
Posts: 27567
raycow
Loc: San Francisco, CA
Reg: 11-26-02
10-31-17 09:49 AM - Post#2712807    
    In response to gregmaz

An automatic conversion of any type will be a lot more work and $ than replacing your stock 3 speed, or even upgrading to a better manual. A few questions first though:

1. Does your present 3 speed trans have a 4 bolt or a 7 bolt side cover?
2. Are you satisfied with your present gearing at highway speeds, or would you prefer that the engine be turning slower?
3. Do you prefer keeping your shifter on the column or would you be ok with a floor shift?

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
gregmaz 
Silver Supporting Member
Posts: 156
gregmaz
Reg: 05-10-10
11-01-17 11:50 AM - Post#2712949    
    In response to raycow

Thx Ray.

It's a 4 bolts, I am going back and forth between AT and another sag with synchro first this time.
Found a couple of rebuilt sag, but they are geared towards circle racers... 284/168 or 351/189

I don't remember what I have in the rear.

Even tho it would be nice to not shift gears and get more speed and mpg, and not get rid of the bench, I guess a manual will get it going again.

Now regarding the gearing, how bad would it be to throw the 351... Combo in this pick up? Undrivable? Wouldn't tow anymore?
I am toying with the idea of dropping the engine and transmission in a Datsun Z one day, but still need the truck to work in the meantime


67 C10 6 inline 4.1l (250) Rochester B
8ft
limited slip 12 bolts
3 on the "peanut" tree

I drive for a living


 
gregmaz 
Silver Supporting Member
Posts: 156
gregmaz
Reg: 05-10-10
11-01-17 11:59 AM - Post#2712951    
    In response to gregmaz

When I inquired about the transmission I found from the speed shop if it would fit behind a 250 in a 67 c10 I got this for an answer:


YES WHEN YOU MUST SPECIFY TRUCK BELL HOUSING BECAUSE THEY ARE LARGE ID BEARING RETIANER THAN CARS

What should I be looking at, should this fit?

http://www.smileysracing.com/shopping/productDetai ...

67 C10 6 inline 4.1l (250) Rochester B
8ft
limited slip 12 bolts
3 on the "peanut" tree

I drive for a living


 
raycow 
Honored Member
Posts: 27567
raycow
Loc: San Francisco, CA
Reg: 11-26-02
11-01-17 01:46 PM - Post#2712968    
    In response to gregmaz

If you have a 4 bolt cover now and it's the original trans, your ratios are 2.94 and 1.68. The closest Saginaw full synchro is 2.85/1.68, and I have found that one to be a very satisfactory replacement for the 4 bolt. You could also use the 3.11 if you prefer, but I would advise against the 3.50 unless you have a specific need for that low of a 1st gear.

If you have a stock 67 truck bellhousing your bearing retainer is about 4.685". This size was also used on all passenger cars 55-up. 68-up trucks (but not passenger cars) are about 5.125".

In other words, you can use a 67-earlier truck trans or a 55-up passenger car trans with your present bellhousing. If you get a 68-later truck trans, you will have to replace its bearing retainer with one from a passenger car or 67-earlier truck trans. The replacement bearing retainer has to be for the same type of trans - a 4 bolt for a 4 bolt or a 7 bolt for a 7 bolt.

If you want to use a passenger car trans, that will be fine, except that its bottom two mounting holes won't be threaded like an original truck trans. In that case, just use longer bolts in those two holes and put nuts on them.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
gregmaz 
Silver Supporting Member
Posts: 156
gregmaz
Reg: 05-10-10
11-01-17 06:32 PM - Post#2712999    
    In response to raycow

Thx again,

What do think is in the back?

67 C10 6 inline 4.1l (250) Rochester B
8ft
limited slip 12 bolts
3 on the "peanut" tree

I drive for a living


 
raycow 
Honored Member
Posts: 27567
raycow
Loc: San Francisco, CA
Reg: 11-26-02
11-01-17 07:00 PM - Post#2713004    
    In response to gregmaz

3.73 was probably the most common axle ratio in these years. However, there is no need to guess what you have as long as you can count up to at least 4.

Crawl under the truck and put matching marks on the pinion yoke and differential housing. Jack ONE rear wheel off the ground and chock the opposite front wheel if you are on anything other than dead flat ground. Put the transmission in neutral and the parking brake off. Can you turn the wheel easily? If yes, you have an open rear. If the wheel is difficult or impossible to turn, you have posi. In that case, jack BOTH rear wheels off the ground.

If you have an OPEN rear, turn the wheel exactly TWO revolutions and count (or have a helper count) the number of complete driveshaft revolutions and estimate any fractional revolution as closely as possible. The number of driveshaft revolutions plus the fraction is your axle ratio. If you have POSI, turn either of the wheels exactly ONE revolution and count the driveshaft revolutions the same as for an open rear.

Easier than you expected, isn't it?

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
gregmaz 
Silver Supporting Member
Posts: 156
gregmaz
Reg: 05-10-10
11-01-17 10:38 PM - Post#2713021    
    In response to raycow

I remember doing this trick because you mentioned it on the forum before, forgot about it, I have to do it again.

2.85x3.73=10.6305

I ll check the tire size next.

Thx for advice

67 C10 6 inline 4.1l (250) Rochester B
8ft
limited slip 12 bolts
3 on the "peanut" tree

I drive for a living


 
gregmaz 
Silver Supporting Member
Posts: 156
gregmaz
Reg: 05-10-10
11-01-17 11:32 PM - Post#2713023    
    In response to gregmaz

Yikes I am still debating putting a 700r4

It would fit me think...
Cross member, TV cable fit, oil cooler, what else to look for?

AT with overdrive would be so nice

67 C10 6 inline 4.1l (250) Rochester B
8ft
limited slip 12 bolts
3 on the "peanut" tree

I drive for a living


 
gregmaz 
Silver Supporting Member
Posts: 156
gregmaz
Reg: 05-10-10
11-02-17 03:29 PM - Post#2713079    
    In response to gregmaz

But I got another sag

67 C10 6 inline 4.1l (250) Rochester B
8ft
limited slip 12 bolts
3 on the "peanut" tree

I drive for a living


 
Stinky 
Senior Member
Posts: 1602

Loc: Whitewater, CO
Reg: 05-25-01
11-04-17 06:01 AM - Post#2713239    
    In response to gregmaz

If you are gonna put an auto in....the only reason to do it would be for the OD. Therefore 700R4 or the other one...I cant remember the # at the moment, 200R4?



 
raycow 
Honored Member
Posts: 27567
raycow
Loc: San Francisco, CA
Reg: 11-26-02
11-04-17 03:06 PM - Post#2713265    
    In response to Stinky

  • Stinky Said:
If you are gonna put an auto in....the only reason to do it would be for the OD.....


Well, that wouldn't really be a reason, because you can always install a manual OD trans. To me, the ONLY reason would be that you are equipped with fewer than the standard issue number of legs.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
gregmaz 
Silver Supporting Member
Posts: 156
gregmaz
Reg: 05-10-10
11-06-17 01:29 PM - Post#2713454    
    In response to raycow

Love the humor but hate the practicality:

I shot my knee / ankle and hip driving in the glorious Parisian traffic and later on driving pro in the easy town of LA.

As much as I like banging gears, I can't do it for long. The truck will get a manual.

Finding a manual OD is quasi impossible - to me.

67 C10 6 inline 4.1l (250) Rochester B
8ft
limited slip 12 bolts
3 on the "peanut" tree

I drive for a living


 
gregmaz 
Silver Supporting Member
Posts: 156
gregmaz
Reg: 05-10-10
11-06-17 01:34 PM - Post#2713455    
    In response to gregmaz



Attachment: IMG_20171101_170924.jpg (3.6 MB) 126 View(s)




67 C10 6 inline 4.1l (250) Rochester B
8ft
limited slip 12 bolts
3 on the "peanut" tree

I drive for a living


 
raycow 
Honored Member
Posts: 27567
raycow
Loc: San Francisco, CA
Reg: 11-26-02
11-07-17 02:44 PM - Post#2713592    
    In response to gregmaz

Is that cracked bearing retainer the only issue? Then not a problem. Those things practically grow on trees. If you have a 67 trans with 4 bolt cover, you should be able to use almost any retainer for a 4 bolt back to 55, either car or truck. Even one off a scrap trans would be ok, and there are plenty of those lying around. Take the old one with you when you go looking.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
gregmaz 
Silver Supporting Member
Posts: 156
gregmaz
Reg: 05-10-10
11-15-17 06:31 PM - Post#2714540    
    In response to raycow

I figured I could get something to fix it up, but putting a used trans with signs of weakness behind a remanufactured engine made little sense.
Hopefully I get to wrench on this this weekend.

67 C10 6 inline 4.1l (250) Rochester B
8ft
limited slip 12 bolts
3 on the "peanut" tree

I drive for a living


 
gregmaz 
Silver Supporting Member
Posts: 156
gregmaz
Reg: 05-10-10
11-15-17 06:40 PM - Post#2714541    
    In response to gregmaz



Attachment: PhotoPictureResizer_171115_173706325-1008x756.jpg (256.58 KB) 131 View(s)


4 bolt housing


67 C10 6 inline 4.1l (250) Rochester B
8ft
limited slip 12 bolts
3 on the "peanut" tree

I drive for a living


Edited by gregmaz on 11-22-17 02:26 PM. Reason for edit: No reason given.

 
gregmaz 
Silver Supporting Member
Posts: 156
gregmaz
Reg: 05-10-10
11-15-17 06:45 PM - Post#2714543    
    In response to gregmaz



Attachment: PhotoPictureResizer_171115_174422087-756x1008.jpg (271.13 KB) 127 View(s)


250 inline 6 1bbl


67 C10 6 inline 4.1l (250) Rochester B
8ft
limited slip 12 bolts
3 on the "peanut" tree

I drive for a living


 
raycow 
Honored Member
Posts: 27567
raycow
Loc: San Francisco, CA
Reg: 11-26-02
11-15-17 07:23 PM - Post#2714559    
    In response to gregmaz

We may have had a slight miscommunication here. When you said "4 bolt", I assumed you were referring to the type of transmission you have (4 bolts hold the side cover onto the transmission case), not the bellhousing.

Both 4 bolt and 7 bolt transmissions were used in 1967 trucks, and they have very little in common with each other, but they will both bolt to the same bellhousing.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
gregmaz 
Silver Supporting Member
Posts: 156
gregmaz
Reg: 05-10-10
11-22-17 02:25 PM - Post#2715358    
    In response to raycow



Attachment: MVIMG_20171118_162856-1008x756.jpg (235.38 KB) 122 View(s)




67 C10 6 inline 4.1l (250) Rochester B
8ft
limited slip 12 bolts
3 on the "peanut" tree

I drive for a living


 
raycow 
Honored Member
Posts: 27567
raycow
Loc: San Francisco, CA
Reg: 11-26-02
11-23-17 06:21 AM - Post#2715438    
    In response to gregmaz

Could you please shoot a pic from the other side of the trans so we can see what the cover looks like? Also, I am mystified by your non-stock crossmember since you still seem to have the stock bellhousing mounts.

Ray

Those who choose an automatic transmission want transportation. Those who choose a manual transmission want to drive.


 
JimKshortstep4x4 
Chevytalk Moderator & "14th Year" Silver Supporting Member
Posts: 5077
JimKshortstep4x4
Loc: Muskegon, MI, USA
Reg: 03-28-02
11-24-17 08:58 AM - Post#2715564    
    In response to raycow

That is a nice looking cross member that is on his truck!

I cannot say that I blame him as the transmission hanging out in space without the cross member looks like trouble as the stock set up looks to me!

Jim

65 Impala SS, 400sbc, Muncie M-22
66 Impala SS, 396, TH 400
69 El Camino, 350, TH 350
71 Short bed stepside 4x4, 350/TH 350
71 Snow plow, 4x4, 350, TH 350
72 GMC Shortbed, stepside, 427/TH 400


 
gregmaz 
Silver Supporting Member
Posts: 156
gregmaz
Reg: 05-10-10
12-11-17 12:58 PM - Post#2717590    
    In response to JimKshortstep4x4



Attachment: IMG_20171210_145846-1612x1209.jpg (554.59 KB) 110 View(s)




67 C10 6 inline 4.1l (250) Rochester B
8ft
limited slip 12 bolts
3 on the "peanut" tree

I drive for a living


 
gregmaz 
Silver Supporting Member
Posts: 156
gregmaz
Reg: 05-10-10
12-11-17 01:02 PM - Post#2717591    
    In response to gregmaz

Mount in, bolts right side up. The cross member pic was a mock up.

Current Hurst shifter Indy 500 no go on this Saginaw.
It hits at the breather up top and at the speedo cable on the side.

Anyone knows of something that fit?

67 C10 6 inline 4.1l (250) Rochester B
8ft
limited slip 12 bolts
3 on the "peanut" tree

I drive for a living


 
gregmaz 
Silver Supporting Member
Posts: 156
gregmaz
Reg: 05-10-10
12-11-17 01:03 PM - Post#2717592    
    In response to gregmaz

Also the gear forks are mismatched, one of them is the wrong kind.

The previous transmission was a "peanut", hence no oem cross member.
Got this one from summit.

67 C10 6 inline 4.1l (250) Rochester B
8ft
limited slip 12 bolts
3 on the "peanut" tree

I drive for a living


Edited by gregmaz on 12-11-17 01:07 PM. Reason for edit: No reason given.

 
gregmaz 
Silver Supporting Member
Posts: 156
gregmaz
Reg: 05-10-10
12-28-17 12:28 PM - Post#2719219    
    In response to gregmaz



Attachment: IMG_20171118_160115-1008x756.jpg (224.35 KB) 112 View(s)




67 C10 6 inline 4.1l (250) Rochester B
8ft
limited slip 12 bolts
3 on the "peanut" tree

I drive for a living


 
gregmaz 
Silver Supporting Member
Posts: 156
gregmaz
Reg: 05-10-10
12-28-17 12:35 PM - Post#2719220    
    In response to gregmaz



Attachment: IMG_20171210_152958-1008x756.jpg (276.54 KB) 108 View(s)




Attachment: IMG_20171210_152821-1008x756.jpg (170.41 KB) 106 View(s)




Attachment: IMG_20171210_152934-1008x756.jpg (157.05 KB) 107 View(s)




67 C10 6 inline 4.1l (250) Rochester B
8ft
limited slip 12 bolts
3 on the "peanut" tree

I drive for a living


 
gregmaz 
Silver Supporting Member
Posts: 156
gregmaz
Reg: 05-10-10
12-28-17 12:40 PM - Post#2719221    
    In response to gregmaz



Attachment: IMG_20171210_151212-756x1008.jpg (226.56 KB) 106 View(s)


This Indy 500 Hurst setup - I believe- is no go. Anyone got the right combo?


67 C10 6 inline 4.1l (250) Rochester B
8ft
limited slip 12 bolts
3 on the "peanut" tree

I drive for a living


 
gregmaz 
Silver Supporting Member
Posts: 156
gregmaz
Reg: 05-10-10
01-15-18 06:50 PM - Post#2721136    
    In response to gregmaz



Attachment: IMG_20180107_160427-1209x1612.jpg (539.39 KB) 103 View(s)




Attachment: IMG_20180107_160821_1-1612x1209.jpg (517.1 KB) 103 View(s)




Attachment: IMG_20180107_160855-1612x1209.jpg (523.75 KB) 101 View(s)




67 C10 6 inline 4.1l (250) Rochester B
8ft
limited slip 12 bolts
3 on the "peanut" tree

I drive for a living


 
bobschevytrucks.com Ecklers

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