Trans problem, where do I start?
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New User
Joined: Feb 2004
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From: Marysville, WA
Trans problem, where do I start?
I will be working on a 1986 Ranger,2.9 EFI, auto trans for a friend. It seems to be stuck in foward, even when it is in park it would like to go foward when you accelerate. It was running fine, put it in parking spot at the store, there it sit till morning. Had to push it backward,( not running), started fine, drove it home. What's next, where should I start looking, the Haynes manual dosn't say much. Hope I'm putting this in the right place, My first post.
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Post Fiend
Joined: Oct 2005
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From: Kiev, Ukraine
if Reverse servo piston is good (easy to check on truck, just drop pan and unscrew four 6mm bolts and check piston and gasket of cover). If it is good, no internal fluid leak, reverse band is bad, and it is really bad becouse you need to drop tranny and fully take it apart to access reverce band. When tranny is taken apart it is a good idea to change all worn parts (really rebuild tranny).
BTW, I saw rev. piston sticks of different lenth. Try longer one.
BTW, I saw rev. piston sticks of different lenth. Try longer one.
Post Fiend
Joined: Oct 2005
Posts: 5,242
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From: Kiev, Ukraine
Anyway you are to take all tranny apart. may be internal leak in valvebody and there is pressure on forward clutch at all tmes, like in D positon.....
So where to srart.... Drop tranny first.
So where to srart.... Drop tranny first.
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New User
Joined: Feb 2004
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From: Marysville, WA
Why can it never be something simple. Still looking for more results before ask owner what he might want to do.
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Elder User
Joined: Oct 2007
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From: Ishpeming Mi.
Trannies are a PITA to work on... period. Long before I found this site I had a shift modulator valve fail on an A4LD and wound up cutting into the floor get to it from inside the cab. I then compounded the problem by riveting a cover plate over the hole before I had adjusted it. Sheesh... As much as I hate to admit it, some jobs are best left to the pro's.
Even worse was the fact that if I had bought the replacement part first I could have done the job in a half an hour with no cutting.
Even worse was the fact that if I had bought the replacement part first I could have done the job in a half an hour with no cutting.
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Post Fiend
Joined: Oct 2005
Posts: 5,242
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From: Kiev, Ukraine
who ever used tranny exchange? I found a sticker on my tranny with phone number to call to change my tranny with rebuilt one and let them get my tranny to rebuild an install to someone......
from other vievpoint A4LD is a tranny that needs to be fully taken apart to change one worn part. There are some thing you can change w.o tranny disassembling - vac. modulator, band servo pistons, governor, parking and rear end bushing. That is all.
All other work require to drop a tranny, take it apart fully. YeaH, to change a pump you need to remove bellhousing only, when bellhousing is removed seems that you can pull OD gears, OD clutch... but to remove OD band you have to remove valve body, to change any ather part you have to pull out all gers and shafts from tranny.
from other vievpoint A4LD is a tranny that needs to be fully taken apart to change one worn part. There are some thing you can change w.o tranny disassembling - vac. modulator, band servo pistons, governor, parking and rear end bushing. That is all.
All other work require to drop a tranny, take it apart fully. YeaH, to change a pump you need to remove bellhousing only, when bellhousing is removed seems that you can pull OD gears, OD clutch... but to remove OD band you have to remove valve body, to change any ather part you have to pull out all gers and shafts from tranny.