my automatic tranny is shifting sparatically and its driving me insane. ill be going the same speed, and it will downshift out of nowhere, then upshift constantly. it dosent shift very easily, seems to get stuck in nuetral. also, when it is cold, it takes about 45 seconds to shift into drive, then when its warm, it takes about 5-10 seconds for it to shift from park to drive. I have a 1989 chevy suburban v2500. i put a turbo hydramatic 400 tranny in it, and this will have been my second rebuild. the modulater is in working conditions, and im pretty sure the vacuum is working, more testing is required. tranny fluid is clean, but i have yet to check the magnet in then tranny pan. the level of fluid was constantly monitered due to its rebuild. its only 2 years old, and ive already rebuilt it before. any diagnostic tips would work wonders for me. i would also like a link to a troubleshooting chart if anyone knows where one exists.
2006-06-27 13:36:06 · 4 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
there are many issues
Valve body dirty,,,maybe warped
clutch pack seals
torque converter
If you have the extra money
take your truck to a trans shop and have it pressure tested to see if it is a clutch pack seal
When you rebuilt the tranny did you check your bushings,maybe theres too much blow by,not holding enough pressure.
An after market kit maybe a problem also,they are not designed to hold up.
I rebuilt afew and so far have got 1 back but I have not torn it down yet to see what the problem is..
They are very touchy,everything has to be right
2006-06-27 13:48:30 · answer #1 · answered by Vulcan 1 5 · 0⤊ 0⤋
A 400 is a lite duty trany. in a suburban V2500 you need a 350 turbo. It will out last a 400 four to one. But from what you are saying about the 400 it sounds like the planatarries are out of it. AGAIN
2006-06-27 14:02:01 · answer #2 · answered by dl200558 5 · 0⤊ 0⤋
Try a bottle of Lucas transmission fluid. my trans was slipping and not shifting very good and I put some in and it cured it, it's good stuff!, it's worth ten bucks to give it a try.
2006-06-27 13:52:08 · answer #3 · answered by mister ss 7 · 0⤊ 0⤋
what kind of vehicle? It feels like the torque converter is going out. enable it heat for a couple of minutes in impartial formerly utilising it in case you do not you will be able to desire to apply up the seize bands..good success
2016-12-08 13:18:32 · answer #4 · answered by Anonymous · 0⤊ 0⤋