700R4 Shifting Woes
#1
700R4 Shifting Woes
To start, I have an 87 700r4. Upgraded from 305 to a strong 350. Installed transgo 700r4 shift kit, .500 boost valve, vette servo, heavy duty 3-4 clutch pack. Also, went from a 2.73 open rear end to ~3.50 posi.
So I have searched for a while and I cannot seem to find how to change the non-WOT shift points. I bought the governor weight kit to change WOT, but had no effect on the light throttle shift points. Some things people have mentioned:
1) Adjust the TV cable to change the light shift points: I think this is a no-no as I have only heard horror stories of people adjusting shift points with the TV cable and destroying their transmission
2) Outside heavy weights on governor have slight effect on shift points: Is this true, could I drill out the weights on the outside an lighten them up?
3) Servo: Already changed to corvette...
I usually wouldn't mind, but the 1-2 shift kicks my **** (all others are nice/smoth). It shifts RIGHT when I am halfway through a corner going ~7mph and it barks (set shift to hard on kit and regretting it). I fear it is straining the differential.
Any thoughts? Has anyone had success modifying the outside weights? Thanks in advance!
So I have searched for a while and I cannot seem to find how to change the non-WOT shift points. I bought the governor weight kit to change WOT, but had no effect on the light throttle shift points. Some things people have mentioned:
1) Adjust the TV cable to change the light shift points: I think this is a no-no as I have only heard horror stories of people adjusting shift points with the TV cable and destroying their transmission
2) Outside heavy weights on governor have slight effect on shift points: Is this true, could I drill out the weights on the outside an lighten them up?
3) Servo: Already changed to corvette...
I usually wouldn't mind, but the 1-2 shift kicks my **** (all others are nice/smoth). It shifts RIGHT when I am halfway through a corner going ~7mph and it barks (set shift to hard on kit and regretting it). I fear it is straining the differential.
Any thoughts? Has anyone had success modifying the outside weights? Thanks in advance!
#2
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Car: 91 Trans am
Engine: built 360 TBI
Transmission: built 700r4
Axle/Gears: 10bolt/3.23
Re: 700R4 Shifting Woes
I played a lot with the governor weights and springs, they only controlled later and earlier shifts, not the issue you are having.
If it does the same thing with the stock governor, I would look in to the shift kit mods about the harsh 1-2 shift.
If it does the same thing with the stock governor, I would look in to the shift kit mods about the harsh 1-2 shift.
#3
Re: 700R4 Shifting Woes
Thank you for the response. I am definitely looking into the hard shift by modifying the shift kit. I am currently running the stock governor (changed weights, but still fine tuning). As far as the governor controlling the earlier shift, did you modify the outer weights to change/delay the early shift?
#4
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Car: check
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Transmission: check
Re: 700R4 Shifting Woes
Sounds like the 2nd accumulator was stacked solid with washers. If so remove them and use heavier springs in it.
RBob.
RBob.
#5
Re: 700R4 Shifting Woes
Any fix advice on the low throttle shift points?
Thanks!
#6
Re: 700R4 Shifting Woes
You can upgrade the shift valves with ones from a z28 or trans am valve body. This will get you more performance part throttle shifts and 5500 rpm WOT shifts with the correct governor. I have a spare valve body if you are interest...
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Car: 91 Trans am
Engine: built 360 TBI
Transmission: built 700r4
Axle/Gears: 10bolt/3.23
Re: 700R4 Shifting Woes
This should explain it better then I could http://www.dragracingonline.com/tech...vi_9-bm-1.html
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#9
Re: 700R4 Shifting Woes
Thank you all for the replies! For anyone reading this with a similar problem, the solution is calling Dana
But really, for a slightly later shift point, remove just the light spring from the governor. And for smooth shifts, never use the washers in a transgo kit.
Morgsie, if I decide to go with the valve body upgrade, will send a PM. Thanks!
But really, for a slightly later shift point, remove just the light spring from the governor. And for smooth shifts, never use the washers in a transgo kit.
Morgsie, if I decide to go with the valve body upgrade, will send a PM. Thanks!
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Re: 700R4 Shifting Woes
Removing the light weight spring in the governor is something I started doing a long time ago and it will make for a slightly later shift point as stated above. This also gives you forced downshifts a little easier. If you still want a later part throttle shift you can use the Sonnax TV Cable Corrector Kit (AS1-01K) setup for this. It installs very easy on the TV cable and you will have to re-adjust the TV cable and this will give you later part throttle shifts without pulling the TV cable out of adjustment.
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