I just had a tranny rebuild not too long ago and my 1-2 shift seems to be slipping on me under about 1/2 throttle. I have adjusted the TV cable the way transfixleo said, so that should fine. Can I have a mechanic look inside the tranny to see if anything is wrong to make the 1-2 shift that way? I am having a guy install a vette servo and .500 boost valve and was going to have him look at the shifting while he installed the parts.

------------------
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER, NO CAT
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
2:73 GEARS
Rebuilt 700R4, with manual valve body
B&M Megashifter
Soon to be installed
3:73 Richmond Gears and 3" Hooker Aero Chamber
Corvette Servo & .500 boost valve
15.61@ 95.2mph G-Teched, 1-2 shift slippage
"There is nothing more addicting than speed"

 

The change alone to the 3.73 gears will make a huge difference in the 1-2 shift quality. I would suggest that instead of the Big Servo/Boost Valve combo that you instead go with the TransGo reprogramming Kit if you really want to improve your tranny and not just cover up a problem.

 

Can the transgo kit be installed with the tranny still in the car, I ask this because I am going off to college in the fall and money is getting tight, and it would be cheaper for me if the tranny isn't being pulled out. Also what does that kit sell for, I think I saw 2 different one's in Summit, one for lie $40 and the other is like $130.

------------------
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER, NO CAT
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
2:73 GEARS
Rebuilt 700R4, with manual valve body
B&M Megashifter
Soon to be installed
3:73 Richmond Gears and 3" Hooker Aero Chamber
Corvette Servo & .500 boost valve
15.61@ 95.2mph G-Teched, 1-2 shift slippage
"There is nothing more addicting than speed"

 

Will the servo/boost combo damage my tranny, I will at least have the servo installed, I just want a snappy shift.

------------------
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER, NO CAT
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
2:73 GEARS
Rebuilt 700R4, with manual valve body
B&M Megashifter
Soon to be installed
3:73 Richmond Gears and 3" Hooker Aero Chamber
Corvette Servo & .500 boost valve
15.61@ 95.2mph G-Teched, 1-2 shift slippage
"There is nothing more addicting than speed"

 

I don't see why the kit can't be installed while the trans is in the car, unless it changes something inside the fluid pump that's not accessable from underneath the pan. My B&M Shift Improver Kit didn't require me to pull the trans.

A trans guy could hook up a line pressure gauge to see if your tranny's getting the fluid pressure it should; and with their experience, could probably diagnose the trans. The only things you can get at from underneath the car is the valve body (or bodies, depending on year), shift linkage, and some areas of the fluid pump (i.e. pressure regulator). You can get at the servo and the governor from the outside. But to check the 2-4 band and the clutches, you need to drop the trans down, pull the fluid pump, and pull the rest out.


------------------
-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards
---Think your car could be pic of the week? Visit http://www.f-body.net for details!

 

As far as the pressure test, is that an uncommon tool, because I'm not taking my car to a shop, this guy is installing my gears for $100 and he guarantees all his work so I figured I will have him look over the rest of my car.

------------------
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER, NO CAT
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
2:73 GEARS
Rebuilt 700R4, with manual valve body
B&M Megashifter
Soon to be installed
3:73 Richmond Gears and 3" Hooker Aero Chamber
Corvette Servo & .500 boost valve
15.61@ 95.2mph G-Teched, 1-2 shift slippage
"There is nothing more addicting than speed"

 

Yes the TransGo kit can be installed in the car. The only thing you won't be able to do is install the Hi Rev release springs that they supply. Hang onto them for future install if it becomes necessary. Also consider their Hi REv Pump Ring Kit too.

It MAY be too late rom what you described but if the oil look OK and if once it is IN a gear, it HOLDS then I would say go ahead. If not then while it is out install the kit and all of it's components plus some goodies like the 4L60E 3-4 pack, vette rear planet, etc.

 

Oh another thing, I'm not sure why my trans does this ever since the rebuild. If I go to WOT in OD or D , the trans doesn't downshift to second, the rpm's won't go over 3000.

------------------
'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
FLOWMASTER, NO CAT
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
2:73 GEARS
Rebuilt 700R4, with manual valve body
B Megashifter, 5" Autometer Tach w/shift lite
Soon to be installed
3:73 Richmond Gears and 3" Hooker Aero Chamber
Corvette Servo & .500 boost valve
15.61@ 95.2mph G-Teched, 1-2 shift slippage
"There is nothing more addicting than speed"

 

The t/v cable can take several test trips to get right, as mine did. I just started with it all the way back and worked up. Got rid of a slip from 1st to 2nd.

 

A pressure test should be a very basic part of diagnosis on an automatic but actually many people wouldn't know what to do with it. Best to stay away from them.