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Username Post: Powerglide & 3.73 diff - Opinions???        (Topic#364135)
makepar 
Newbie
Posts: 4

Reg: 01-26-21
01-26-21 05:42 PM - Post#2813024    

Have a couple questions actually. I have 67 with 350 motor, 2 speed powerglide & 8.2 gm diff with 3.73 Yukon gears and carrier, 27" tire diameter. Currently run about 3k rpm @ 65mph. Looking to get rpms down, looked Yukon carrier up and lowest I can go is 3.08 with that carrier with other options of 3.36 or 3.55. Like to travel so want rpms down but also don't want it to be a dog off the light. 3.08 too low??? Should I stick with Yukon(know they were bought out a while ago) did quality go down hill? Any other suggestions. I know th350 option available but would like to keep powerglide. Suggestions/Opinions??? Thanks.



Edited by makepar on 01-27-21 06:40 AM. Reason for edit: No reason given.

 


killerkjn 
Member
Posts: 103

Loc: Edgewood, WA, usa
Reg: 12-19-02
01-27-21 07:08 AM - Post#2813070    
    In response to makepar

Have you ever thought about putting an overdrive automatic transmission like a 2004r or a 700r4 in your car? Those 3.73 rear gears are perfect for those transmissions. I have a 2004r in my 62 impala with 3.70 rear gears and 28” tires. It is quick off the line and runs at 2300 rpms at 70 mph. It is the best mod I have done to my car for drivability.



 
rcr3 
Site Ambassador -"17th Year" Silver Supporting Member
Posts: 3401
rcr3
Age: 69
Loc: MANHEIM PA. U.S.A.
Reg: 11-24-02
01-27-21 09:03 AM - Post#2813078    
    In response to killerkjn

/\/\/\/\/\/\
Good advice above!

'67 Camaro survivor
'06 Z71 Sierra Ex Cab
'37 Chevy cp.SOLD!!6/7/14
'00 S10 Ex Cab BUILT FOR EVERYDAY,NOT JUST THE HOLIDAYS
'73 Nova pro-street project
'17 Chevy Trax LT







 
Mel Foye 
*VIP* Original Founding Member Group
Posts: 5028
Mel Foye
Reg: 09-29-00
01-27-21 04:33 PM - Post#2813102    
    In response to makepar

Starting with KEEPING the PG. 3,000 at 65. 1:70 low gives you acceptable take off but too many revs on highway.
If you go from 3:73 to 3:55 you drop rpm by 5%, 3:73 to 3:36 drops by 10%. So 3,000 drops to 2,850 or 2,700. So slower off the line and not much lower rpm. I have done a number of 4-6,000 trips and I would NOT go the way of changing rear end gears with a PG.
Now the PG is a good trans in and of itself and you are ok with take off with the combo of 1:70 and 3:73 so add a Gearvendor's with a .78 OD and 65 gives 2,300 rpms.
------------------------- -------------------------
MY WAY would be to leave the 3:73s and go with a 200r4 for both ends. Now low would be 2:74 vs 1:70 and that would be a big change when starting off.
The .67 OD would give you 2,000 at 65. With a non computer I would NOT go below 2,000 rpms on the road. Mel



 
makepar 
Newbie
Posts: 4

Reg: 01-26-21
01-28-21 07:10 AM - Post#2813124    
    In response to killerkjn

Thank You very much for the information/options to consider! Not trying to question your suggestions, I am kind of inexperienced in this dept. and am sure it is typo but you said 2004r tranny, did you mean 200r4? Just want to get info right. Thanks Again!



 
killerkjn 
Member
Posts: 103

Loc: Edgewood, WA, usa
Reg: 12-19-02
01-28-21 08:39 AM - Post#2813128    
    In response to makepar

No that is not a typo. I don’t know why gm did this but they call one transmission a 700r4. The other they call a 2004r. The 2004r I put in my 62 impala came out of a 86 Monte Carlo SS. I found it on Craigslist quite a few years ago for $200.






 
The Factory Man 
Member
Posts: 151
The Factory Man
Age: 70
Loc: Tacoma Washington
Reg: 05-28-04
01-28-21 08:59 PM - Post#2813174    
    In response to killerkjn

That is correct! I believe GM calls it a 200-4R.

Retired and loving it!!!
Steven L Jones
33 years with General Motors Product Service Engineering.
A.S.E. Certified.


 
killerkjn 
Member
Posts: 103

Loc: Edgewood, WA, usa
Reg: 12-19-02
01-30-21 07:17 PM - Post#2813300    
    In response to The Factory Man

Hey Factory Man,
200-4R, yes that looks right. I see you are in Tacoma. If you happen to see a Red 1962 Impala with a white top and Cragar ss wheels flying down I-5 around the Tacoma Dome area going about 80 turning 2500 rpm in overdrive lockup. That is me!



 
The Factory Man 
Member
Posts: 151
The Factory Man
Age: 70
Loc: Tacoma Washington
Reg: 05-28-04
01-30-21 10:40 PM - Post#2813308    
    In response to killerkjn

I will look for you!

Retired and loving it!!!
Steven L Jones
33 years with General Motors Product Service Engineering.
A.S.E. Certified.


 
makepar 
Newbie
Posts: 4

Reg: 01-26-21
02-05-21 05:00 AM - Post#2813649    
    In response to killerkjn

Thanks again for the info and clarifying it is a 200-4r that I need to look for. A couple of other questions that I have if you don't mind answering? Is there specific years of the 200-4r I should be looking for? I imagine there were better ones than others? Also, what else will need to be changed out with the swap from powerglide to 200-4r? I imagine drive shaft length will be different and yoke splines probably different? Will crossmember be different? Will it need new throttle valve cable(is there model kit available for different carburetor styles)? Will torque converter need changing I imagine? Not sure what stall torque I will need? Will it need to be a a Lock-up converter or Non-Lock-up converter? Anything else you can think of? Any and all info is very helpful! Thanks Again!!!



 
killerkjn 
Member
Posts: 103

Loc: Edgewood, WA, usa
Reg: 12-19-02
02-06-21 04:09 PM - Post#2813738    
    In response to makepar

The 200-4r’s were produced from the early 80’s thru about the early 90’s. The best I believe are the late 80’s. The best performers came out of Buick Grand National’s with a BRF codes and the ones from 86-88 Monte Carlo ss with a CZF codes. Also Olds 442/Hurst with KZF codes. I think you would best off with the CZF Monte Carlo. These were setup for 3.73 rear gears. Your shift points, speedometer gear and governor would not need to be messed with. They are also easier to find than other codes. The 200-4R is the same length as your powerglide and I believe it has the same yoke spline count. It does have a different cross member. I got mine from Bowtie Overdrives, it was a bolt in change. My car has a column shift, so I used a Lokar universal shift rod. The hardest part of the swap was getting the tv cable and lockup circuit setup just right. I would definitely use a lockup converter that and the overdrive are the best part of the swap.



 
killerkjn 
Member
Posts: 103

Loc: Edgewood, WA, usa
Reg: 12-19-02
02-06-21 04:28 PM - Post#2813741    
    In response to killerkjn

They do make tv corrector brackets for different carburetors. It is VITAL that you get the right geometry. If it is wrong you can mess up your transmission fast.



 
makepar 
Newbie
Posts: 4

Reg: 01-26-21
02-16-21 08:20 AM - Post#2814380    
    In response to killerkjn

Thanks again for the info, I appreciate it. Which level 200-4r did you get? I think I can get by with a level 1, mild street as am looking to make it more of a cruising camaro than street rod. By geometry you are talking about making sure the throttle body valve is all the way out when at idle and fully depressed when carb/throttle is at full throttle/end range of motion, correct?



 
killerkjn 
Member
Posts: 103

Loc: Edgewood, WA, usa
Reg: 12-19-02
02-19-21 09:17 AM - Post#2814624    
    In response to makepar

My 200-4R came out of an 86 Monte Carlo ss. The car had been totaled, but the owner told me the transmission worked great. Since my car only has a 283 with a Rochester 2gc carb I just dropped it in as is. It has performed flawlessly. The best $200 I have ever spent. So I don’t really know much about the levels of rebuilds. As for the geometry, I used the power glide kick down attachment. The travel distance was right for the tv cable but the degree angle was off so my shifts were too early and stacked (which is not good). I then added a SonnaxAS1-01K corrector spring which did the trick. You have to have both the correct pull distance and the pull angle to get the shifts right.



 
BigDogSS 
"12th Year" Silver Supporting Member
Posts: 4896
BigDogSS
Loc: SoCal
Reg: 12-21-01
02-24-21 04:05 PM - Post#2815026    
    In response to makepar

I'd go 700-R4 over 200-4R. I know there are slight difference in the transmission ratios, but according to a gentleman at Bowtie Overdrives I talked to at a swapmeet:
1) The average user could not tell the difference.
2) Their business is 80% 700-R4, but 80% of the phone tech support is for 200-4R. 700-R4 is easier to set up.

A buddy of mine had a similar situation: 1967 Camaro RS - 327/PG and 3.73 gears. Talked about going 700-R4 for YEARS.
He finally took the leap (sort of) --> we converted his car to a 5-speed manual from Silver Sport Transmissions.
It worked out GREAT!! The kit was all inclusive and install was easy.

    1967 Chevrolet Impala SS convertible 327 - Ermine White C1 - VCCA Senior Award
    1967 Chevrolet Impala SS Sport Coupe 396 - Marina Blue FF - personal "barn-find" lol



Edited by BigDogSS on 02-24-21 05:09 PM. Reason for edit: No reason given.

 


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