North American Turbocoupe Organization



need transmission help
Gene Offline
Member
#1
My Overdrive took a dump on me on the way home from work. All the other gears seem to work fine but if I try to put it in Odrive, the engine just revs but no forward pull. I'm wondering what could have broke and how to go about fixing the A4LD.

My 88 TurboCoupe doesn't have alot of pull getting around traffic so I tend to fall back a ways and then get a run on cars to pass. Today, I was building up some speed to get around a few cars, pressed the pedal to make the car downshift just as I was pulling out, and all of the sudden the revs went really high and the car did nothing. It has done this before but recovered shortly after. Not this time. I can run through each gear and drive down the highway in drive, but Odrive is unuseable.

The transmission fluid was recently changed a few weeks ago so I know that's good. Could the torque converter have gone bad or does this sound more internal.
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fierospeeder Offline
Member
#2
look at getting your trans rebuilt.

It could be the overdrive drum assembly.


Minimum for a rebuild is 800 dollars to 1500. If you do, i suggest getting everything in the overdrive assembly be replaced for new. And having the alignment of the bellhousing to the pump checked too, because it tends to blow the seals out.

I think theres a link on here to the ranger site where theres a lot of talk about the a4ld.
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fierospeeder Offline
Member
#3
http://www.turbotbird.com/techinfo/AutoT...LD_Fix.htm

just like that article says. REPLACE the hard parts. I've been there and had the hard parts fail a year later.
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Jeff K Offline
Administrator
#4
Maybe time to think about converting to a 5 speed. The car will be MUCH more fun than it is with the POS A4LD.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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Gene Offline
Member
#5
Has anyone heard of an electrical connection outside or inside the transmission becoming corroded and causing this problem. Someone I know said he was having a similar problem with another car and turned out something as simple as cleaning the connection.
Also, any companies out there sell A4LD's for unbeatable prices? I seem to recall seeing a site that had a decent price but I didn't add it to my fav's.
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DonH Offline
Posting Freak
#6
http://natomessageboard.com/ultimatebb.p...p=1#000004
1987 TC stock except ATR 2.5"
1983 Pontiac Transam T-top 5.7 T56 [email protected] top speed: 176mph
1978 Fairmont 2.3 4-spd Big-top S/W
1946 Willys CJ2A 134.2ci L4 No-top
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Jeff K Offline
Administrator
#7
If the ONLY problem was no oD, then an electrical problem between the EEC and the tranny could be an issue, but from what you describe with the "engine just revs, no forward pull" sounds to me like an internal trans failure.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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DonH Offline
Posting Freak
#8
From the manual:
Slipping 4th gear-Overdrive servo damaged or leaking
Polished or glazed overdrive band or drum
1987 TC stock except ATR 2.5"
1983 Pontiac Transam T-top 5.7 T56 [email protected] top speed: 176mph
1978 Fairmont 2.3 4-spd Big-top S/W
1946 Willys CJ2A 134.2ci L4 No-top
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Gene Offline
Member
#9
http://natomessageboard.com/ultimatebb.p...p=1#000004

From the link listed above, could someone list the locations for each part/connection to check and maybe how to test them/damage to look for.
I'd like to check out some of these myself before giving it to a transmission repair shop and spending a large sum. I have a feeling pulling the existing trans out and purchasing a reman would cost just as much.

Thanks
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Shane Wherry Offline
Senior Member
#10
The overdrive hub are famous for blowing out. I had an Explorer with the junk A4LD and it blew the OD hub.
1988 Thunderbird Sport 351w/5.8L swap, Mustang 4R70W trans swap, Turbo coupe front brakes and rear diff swap with turbo coupe prop valve, Turbo coupe hood, Turbo coupe wheels.
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