changing shift point on 700r4
Thread Starter
Pro
Joined: Jun 2002
Posts: 662
Likes: 2
From: chatam nj
changing shift point on 700r4
have a 94 c4 with 3.08 rear, 1800 stall, and hotcam kit. currently has early shift and want to change the shifting to later (around 5500 to 6000 range) further apart.
anyone know which b&m weights and springs to use, from the recalibration kit? figure to post on the forum vs going trial/error route. let me know what your using. thanks
anyone know which b&m weights and springs to use, from the recalibration kit? figure to post on the forum vs going trial/error route. let me know what your using. thanks
Drifting
Joined: Mar 2015
Posts: 1,275
Likes: 165
From: Utah
I'm not to helpful but i used a transgo 700p shift kit with stick option on my c4 when i rebuilt the trans.
while I'm not a big fan of their instructions (like it was written by a mentally challenged hipster, or maybe stoned) i was able to do some tuning with the shift points.
What i really like about my transmission post mod is shifting it manually.
I'll put the car in od if i dont want whiplash shifts, and if i plan on leaving everyone in the dust i shift manually.
post mod i get instant shifts when i move the stick, and it will hold the gear until something breaks if i want to.
while I'm not a big fan of their instructions (like it was written by a mentally challenged hipster, or maybe stoned) i was able to do some tuning with the shift points.
What i really like about my transmission post mod is shifting it manually.
I'll put the car in od if i dont want whiplash shifts, and if i plan on leaving everyone in the dust i shift manually.
post mod i get instant shifts when i move the stick, and it will hold the gear until something breaks if i want to.
Last edited by Gibbles; Oct 13, 2016 at 08:59 PM.
Melting Slicks
Joined: Nov 2013
Posts: 3,451
Likes: 336
From: Greater Cincinnati Area.
Regardless.. Gibbles is right. On the 700, a good shift kit will let you tune the shift points by changing the governor springs. (Some also modify the weights as well.)
You can get these separately. They're also pretty generalized. If you have light springs laying around that fit? You can use those too. It doesn't matter, although you won't get the benefit of the full kit.
But the "E" unit is different. "E" stands for "Electronic" and you'll have to change that with a tuner.
On the E, you grab the shifter and you move the manual valve in the valve body, pump up the forward clutch and you go.. But from there, the computer sets the shift schedule.
So, it takes a tuner.
In either unit, beware cheap "shift kits" for racing. Some of the better ones actually do things to increase the capacity of the transmission. Not a tremendous amount, but it matters.
Whereas some of the cheap ones basically just increase feed orifice size and/or stiffen the accumulators to make the shift feel rockin, but it doesn't do much else. If that is all you want, you can do that with a drill bit, almost for free.
You can get these separately. They're also pretty generalized. If you have light springs laying around that fit? You can use those too. It doesn't matter, although you won't get the benefit of the full kit.
But the "E" unit is different. "E" stands for "Electronic" and you'll have to change that with a tuner.
On the E, you grab the shifter and you move the manual valve in the valve body, pump up the forward clutch and you go.. But from there, the computer sets the shift schedule.
So, it takes a tuner.
In either unit, beware cheap "shift kits" for racing. Some of the better ones actually do things to increase the capacity of the transmission. Not a tremendous amount, but it matters.
Whereas some of the cheap ones basically just increase feed orifice size and/or stiffen the accumulators to make the shift feel rockin, but it doesn't do much else. If that is all you want, you can do that with a drill bit, almost for free.
Thread Starter
Pro
Joined: Jun 2002
Posts: 662
Likes: 2
From: chatam nj
yes, it's a 94 with a 700r4 (prior owner replaced the 4l60e, not sure why).
the 700r4 has a shift kit. when driving the gears shift sooner then it's should. is there a chart or some kind that has the b&m governor weigth/spring and shows the shift rpm range?
the 700r4 has a shift kit. when driving the gears shift sooner then it's should. is there a chart or some kind that has the b&m governor weigth/spring and shows the shift rpm range?
Team Owner
Joined: Sep 2003
Posts: 25,373
Likes: 2,734
Is it still PCM engine control? ASR, TV, TB and all controls are just vastly different from ECM/4L60 and PCM/4L60e. How was VSS for speedo/odo done?
Last edited by WVZR-1; Oct 14, 2016 at 08:12 AM.
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Thread Starter
Pro
Joined: Jun 2002
Posts: 662
Likes: 2
From: chatam nj
yeah. he putted all of of the stock drive train out. the c4 was stock, then went to the 1/4 track car, then made it back to street(using the stock lt1 but mild modify). the orig motor was pulled and set aside for the track motor.
i searched around the net for combo of weigth/spring to rpm. came across this link, but no one says if the combo worked for them.
http://www.thirdgen.org/forums/transmissions-drivetrain/386811-need-higher-shift-points.html
anyone have any recent input?
i searched around the net for combo of weigth/spring to rpm. came across this link, but no one says if the combo worked for them.
http://www.thirdgen.org/forums/transmissions-drivetrain/386811-need-higher-shift-points.html
anyone have any recent input?
Oil Producer
Joined: Apr 2014
Posts: 9,364
Likes: 2,734
OP, you are probably wanting a straight answer about the governor kits....the reason you are getting questions and clarification requests is because it depends on what you are running right now which sounds very modified.
if you have a 700r4 then u have a TV cable right? These will affect pressures which will affect shift points.
i thought the solution on my 700r4 was a different governor kit....it wasnt....it was the prom chip!
what year engine do you have in it now?
what year 700r4 do u have in now?
is there a tv cable installed? if yes what length / part number?
if you want to ho ahead and trial and error, general rule of thumb is to decrease weight and increase spring strentgh and that will give you higher shifts. not sure why u would want that though.
if you have a 700r4 then u have a TV cable right? These will affect pressures which will affect shift points.
i thought the solution on my 700r4 was a different governor kit....it wasnt....it was the prom chip!
what year engine do you have in it now?
what year 700r4 do u have in now?
is there a tv cable installed? if yes what length / part number?
if you want to ho ahead and trial and error, general rule of thumb is to decrease weight and increase spring strentgh and that will give you higher shifts. not sure why u would want that though.
Race Director
Joined: Apr 2003
Posts: 17,699
Likes: 1,667
From: moraga ca
When I was running a 700R4, I spent a lot of time dialing in the shift points for part throttle and full throttle shifts. I bought 2 B&M kits; swapped out springs and weights and use those provided with the kits and stock governor setups. I even ground down some of the weights to custom lighten them. Springs affect mainly part throttle shifting; weights mainly full throttle shifting although they are both interrelated. A stronger spring will give higher part throttle shift points, a lighter weight will give higher full throttle shift points. Good luck.
Melting Slicks
Joined: Nov 2010
Posts: 2,216
Likes: 113
From: Michigan
Ebay has the generic kits that are cheaper and like 383vette I bought a 2nd to dial it in better(not done that yet). It's mostly trial & error and you will still have to prob take it out a few times, but you have same gear same so this may get you close(disclaimer this could be too high for your exact combo so you need to be careful). 6g & 8g(two holes drilled, maybe 1/8" bit can't rem but I drilled them in the corners at the out side of the weight) purple and orange spring 5900 1-2 and 5700 2-3, change the orange to yellow and it might be both 5700 shifts.
Take notes and keep track of each change. I tried to mod one of the stock weights and another out of the kit but went too far and would have to weld on them to fix. I just bought another kit cause I wanted to try two of the same strength springs or even weights.
edit: Still waking up n reread my notes, also g=grams and the 6 & 8 is not exact.
edit2: two holes are both on the 8g only incase that wasn't clear an I'd suggest trying it w/o 1st it'll only shift lower w/o them.
Take notes and keep track of each change. I tried to mod one of the stock weights and another out of the kit but went too far and would have to weld on them to fix. I just bought another kit cause I wanted to try two of the same strength springs or even weights.
edit: Still waking up n reread my notes, also g=grams and the 6 & 8 is not exact.
edit2: two holes are both on the 8g only incase that wasn't clear an I'd suggest trying it w/o 1st it'll only shift lower w/o them.
Last edited by BOOT77; Oct 14, 2016 at 04:45 PM.
Race Director
Joined: Apr 2003
Posts: 17,699
Likes: 1,667
From: moraga ca
Ebay has the generic kits that are cheaper and like 383vette I bought a 2nd to dial it in better(not done that yet). It's mostly trial & error and you will still have to prob take it out a few times, but you have same gear same so this may get you close(disclaimer this could be too high for your exact combo so you need to be careful). 6g & 8g(two holes drilled, maybe 1/8" bit can't rem but I drilled them in the corners at the out side of the weight) purple and orange spring 5900 1-2 and 5700 2-3, change the orange to yellow and it might be both 5700 shifts.
Take notes and keep track of each change. I tried to mod one of the stock weights and another out of the kit but went too far and would have to weld on them to fix. I just bought another kit cause I wanted to try two of the same strength springs or even weights.
edit: Still waking up n reread my notes, also g=grams and the 6 & 8 is not exact.
edit2: two holes are both on the 8g only incase that wasn't clear an I'd suggest trying it w/o 1st it'll only shift lower w/o them.
Take notes and keep track of each change. I tried to mod one of the stock weights and another out of the kit but went too far and would have to weld on them to fix. I just bought another kit cause I wanted to try two of the same strength springs or even weights.
edit: Still waking up n reread my notes, also g=grams and the 6 & 8 is not exact.
edit2: two holes are both on the 8g only incase that wasn't clear an I'd suggest trying it w/o 1st it'll only shift lower w/o them.
Melting Slicks
Joined: Nov 2013
Posts: 3,451
Likes: 336
From: Greater Cincinnati Area.
Many people prefer the "E" for this reason. You have to "old school" the hydraulic units.
The good news is it's not terribly expensive to do. Just kind of a pain. Little time consuming like that.
If it is shifting way, way, early you may find the governor stuck or damaged, and save some time there.
Good luck.