rustyr
Forum Newbie
Posts: 14
Reg: 09-07-10
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03-06-12 01:45 PM - Post#2199251
Does anyone have experience setting up a Ramjet 350 with a 700r4 transmission? I am looking for the correct bell crank on the throttle body linkage. When I set up my TV cable for the correct shift points, the cable comes up short of WOT.
I know I can buy the $170 kit from Bowtie Overdrives, but I'm hoping to avoid that for the $40 part I need.
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 acardon
"9th Year" Silver Supporting Member
Posts: 9453
Loc: DFW TEXAS
Reg: 03-25-05
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03-06-12 02:04 PM - Post#2199261
In response to rustyr
The Ramjet throttle body IS set up for a 700R4 TV cable. It gives exactly the correct amount of movement from idle to WOT. Shift points ARE NOT controled by the TV cable. Check with Bow Tie Overdrive or Pheonix Transmission.
Don
66 Corvair (driving)
57 2dr HT (restoring)
56 2dr HT (waiting to be restored)
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Allan In NE
Contributor
Posts: 898
Reg: 12-27-11
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03-06-12 02:53 PM - Post#2199288
In response to acardon
Now Don,
You know better than that.
On the M8 (what you guys call a 700R4), the throttle cable is just about EVERYTHING as far as shift points.
Allan
| Lifelong GM automatic transmission specialist |
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rustyr
Forum Newbie
Posts: 14
Reg: 09-07-10
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03-06-12 03:36 PM - Post#2199305
In response to Allan In NE
That proves what opinions are like. Now that Don and Allan have had it out, what's the answer...?
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D.Mac
Senior Member
Posts: 969
Loc: Ontario Canada
Reg: 03-22-03
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03-06-12 04:16 PM - Post#2199319
In response to rustyr
The TV (throttle valve) controls the line pressure with respect to throttle position.
Same function as a modulator valve with respect to engine load(vacuum) in a TH350/400 etc.
The shift points are the job of the governor valve springs and weights.
The reason adjusting the TV cable affects the shift point is because the governor valve has to work against the line pressure to move. Higher line pressure, later shifts. Higher line pressure's are harder on the tranny.
The TV setting is just that , a setting. 95-100 lbs line pressure at idle, 220-240 at WOT. Don't care where your shift points are.
The wrong TV cable geometry or setting most times leads to low line pressure and dead trannies.
Dave MacDonald
Ontario, Canada
'66 Impala LT1/C950-,EFI,700R4,(sold 07/2011)
'12 Sonic LTZ, Turbo, M6
'07 Pontiac Solstice GXP
'06 Caddy CTS-V |
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acardon
"9th Year" Silver Supporting Member
Posts: 9453
Loc: DFW TEXAS
Reg: 03-25-05
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03-06-12 05:23 PM - Post#2199337
In response to D.Mac
Now Don,
You know better than that.
On the M8 (what you guys call a 700R4), the throttle cable is just about EVERYTHING as far as shift points.
As Dave said, by mal-adjusting the TV cable, you can change the shift points and ruin the transmission. Phonix and Bowtie Overdrive will not warrenty a transmission if they find out the TV cable is out of adjustment.
Don
66 Corvair (driving)
57 2dr HT (restoring)
56 2dr HT (waiting to be restored)
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Allan In NE
Contributor
Posts: 898
Reg: 12-27-11
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03-06-12 07:28 PM - Post#2199396
In response to rustyr
That proves what opinions are like. Now that Don and Allan have had it out, what's the answer...?
Sorry,
Just trying to give some help from my 50+ years of repairing Chevrolet automatic transmissions.
Guess I just don't consider it an "opinion"; I kinda know how they work.
Allan
| Lifelong GM automatic transmission specialist |
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rustyr
Forum Newbie
Posts: 14
Reg: 09-07-10
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03-06-12 07:50 PM - Post#2199405
In response to Allan In NE
Got it. 50 years is a long time. So how do I make it right? I still don't understand how to set it up. Do I mess with the reach of the bell crank? Do I try a different governor spring? I understand the theory. What's the practical answer?
I was being smart when I shouldn't have.
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Allan In NE
Contributor
Posts: 898
Reg: 12-27-11
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03-07-12 06:40 AM - Post#2199501
In response to rustyr
No, no.
I'm new around here so gotta watch my step so's I'm not too darned pushy--sure don't want that. 
Spent my life in Chevy garages, so if you've got some different kind of cable arrangement than the stock Chevy cable, I probably can't help you much.
However, if you are using the stock cable, push the button on the housing in and shove the sheath all the way rearward. Then, at the throttle body, crank the throttle wide open. The cable housing will ratchet forward setting the cable/throttle geometry.
If you're heavy footed, leave it right there.
However, if you want a really nice shift and aren't a wild man as far as operation goes, bring the ratchet one more click (1/32") forward. This puts that throttle valve at optimum and makes for a shift that can hardly be felt under normal driving conditions.
And just for what it's worth, if everything is set right, line pressure ought to run in at about 60 lbs, give or take depending on throttle position, under normal driving operation.
Since reverse uses double reduction gearing, line pressure is forced to twice that amount (minimum) to keep the resultant torque from burning thru the low-reverse and reverse input clutches.
Hope this helps somewhat. If I had a picture of your setup, maybe I could be of more help.
Allan
| Lifelong GM automatic transmission specialist |
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