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-   -   th350 fairbanks kit down shift problems (http://www.hotrodders.com/forum/th350-fairbanks-kit-down-shift-problems-202935.html)

bink32 07-30-2011 11:23 PM

th350 fairbanks kit down shift problems
 
im having problems with a fairbanks shift kit . i installed as per the instruction and made it full man valve body as per instructions. problem is it shifts great up shifting but will not manually shift back into first untill im almost at a dead stop. this is in a mud bog truck and i really need it to down shift under full throttle when needed. any suggestions?

Crosley 07-31-2011 09:57 AM

Quote:

Originally Posted by bink32
im having problems with a fairbanks shift kit . i installed as per the instruction and made it full man valve body as per instructions. problem is it shifts great up shifting but will not manually shift back into first untill im almost at a dead stop. this is in a mud bog truck and i really need it to down shift under full throttle when needed. any suggestions?


Since I do not know how the Fairbanks kit is designed... and I doubt the kit is too different from a TransGo kit.

Is the governor used in the Fairbanks kit? Or is it eliminated?

Vacuum modulator used or removed?

My guess is the governor circuit is flooded and the trans will not bump back to first like it should. This happens in a TransGo kit install about 2 out of 10 times.

A hole is drilled into the governor circuit may help. About .065 size hole is a good size to start. Valve body removal is needed. Drill the hole in the circuit at the rear of the v-body is easiest

bink32 07-31-2011 10:10 AM

Quote:

Originally Posted by Crosley
Since I do not know how the Fairbanks kit is designed... and I doubt the kit is too different from a TransGo kit.

Is the governor used in the Fairbanks kit? Or is it eliminated?

Vacuum modulator used or removed?

My guess is the governor circuit is flooded and the trans will not bump back to first like it should. This happens in a TransGo kit install about 2 out of 10 times.

A holes drilled into the governor circuit may help. About .065 size hole is a good size to start. Valve body removal is needed. Drill the hole in the circuit at the rear of the v-body is easiest

governor is used with springs to hold wide open the modulator is there but no vac to it . the instruction say to leave modulator in but not use vac to it. however it does give an option to remove it and use a plud to hold the valve.,but the instruction say not to use the plug if using the manual valve body option

Crosley 07-31-2011 10:14 AM

Quote:

Originally Posted by bink32
governor is used with springs to hold wide open the modulator is there but no vac to it . the instruction say to leave modulator in but not use vac to it. however it does give an option to remove it and use a plud to hold the valve.,but the instruction say not to use the plug if using the manual valve body option


Vacuum modulator is there to blow off pressure in reverse. Reverse pressure can go over 300 if a aluminum plug is installed in place of the vacuum modulaotor

Sounds like this kit is similar to TransGo. The hole in the governor circuit should fix the problem. The hole plows off some pressure to allow the down shift to first

bink32 07-31-2011 10:32 AM

Quote:

Originally Posted by Crosley
Vacuum modulator is there to blow off pressure in reverse. Reverse pressure can go over 300 if a aluminum plug is installed in place of the vacuum modulaotor

Sounds like this kit is similar to TransGo. The hole in the governor circuit should fix the problem. The hole plows off some pressure to allow the down shift to first

thank you ill give it a try!!!

bink32 07-31-2011 11:12 AM

Quote:

Originally Posted by Crosley
Vacuum modulator is there to blow off pressure in reverse. Reverse pressure can go over 300 if a aluminum plug is installed in place of the vacuum modulaotor

Sounds like this kit is similar to TransGo. The hole in the governor circuit should fix the problem. The hole plows off some pressure to allow the down shift to first

i just want to be correct drill a hole in the governer circuit anywhere at the rear of the case correct? i just dont want to put it in the wrong place. if you had a diagram that would be great again just dont want to put it in wrong place.

anglia427 07-31-2011 11:27 AM

fairbanks
 
its exactly the same as a transgo system try what crosley sugested,those kits are made by superior they put a fairbanks logo on them(fairbanks have not been in business in years )

bink32 07-31-2011 11:41 AM

Quote:

Originally Posted by anglia427
its exactly the same as a transgo system try what crosley sugested,those kits are made by superior they put a fairbanks logo on them(fairbanks have not been in business in years )

im not sure i totaly understand where to drill the hole at? drill it in the case ? where will the excess fluid go just dont want to mess it up

Crosley 07-31-2011 12:03 PM

Remove the valve body and drill the hole in the valve body. In the governor circuit at the rear of the valve body.

You installed the kit, I figure you know a little about the transmission?

bink32 07-31-2011 12:15 PM

Quote:

Originally Posted by Crosley
Remove the valve body and drill the hole in the valve body. In the governor circuit at the rear of the valve body.

You installed the kit, I figure you know a little about the transmission?

ok got thanks i thought that just wanted to be sure it was there and not the case side thanks

bink32 07-31-2011 02:01 PM

Quote:

Originally Posted by Crosley
Since I do not know how the Fairbanks kit is designed... and I doubt the kit is too different from a TransGo kit.

Is the governor used in the Fairbanks kit? Or is it eliminated?

Vacuum modulator used or removed?

My guess is the governor circuit is flooded and the trans will not bump back to first like it should. This happens in a TransGo kit install about 2 out of 10 times.

A hole is drilled into the governor circuit may help. About .065 size hole is a good size to start. Valve body removal is needed. Drill the hole in the circuit at the rear of the v-body is easiest

thank you again works like a champ !!!!!


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