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Praying it's not the transmission!


 
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1NASTYZJ
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Joined: 08 Nov 2006
Location: Maryland

PostPosted: Wed Nov 08, 2006 1:35 pm    Post subject: Praying it's not the transmission! Reply with quote

I just bought a 95 GC 4.0 that needs a lot of love. It has a lot of issues, including numerous electrical demons, but the one that has everyone a little confused is this - on the 1-2 upshift the rpm's will repeatedly surge & drop until you press the gas a little harder. It feels like something slipping & it makes the whole truck "buck". It only does this upshifting from 1 to 2, no other time and if you accelerate pretty hard it doesn't do it as much. Any ideas?
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swamp boy
Cherokee Muderator
Cherokee Muderator


Joined: 01 Jan 2004
Location: New Orleans LA.

PostPosted: Wed Nov 08, 2006 10:24 pm    Post subject: Reply with quote

Change the Throttle position sensor ..It has some affect on 1-2 shift..


Also wouldnt hurt to flush the transmission and put in fresh filter and fluid..
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Unless you include the sawzall work..

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1NASTYZJ
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Joined: 08 Nov 2006
Location: Maryland

PostPosted: Thu Nov 09, 2006 8:02 am    Post subject: Reply with quote

Thanks for the advice! The mechanic were I work replaced the tps with one that came off a total loss ( I work in the office of a body shop ) And that didn't help. But I will try changing the trans fluid & filter. Smile
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Tardis
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Joined: 07 Aug 2004
Location: Ohio

PostPosted: Thu Nov 09, 2006 10:16 am    Post subject: Re: Praying it's not the transmission! Reply with quote

1NASTYZJ wrote:
I just bought a 95 GC 4.0 that needs a lot of love. It has a lot of issues, including numerous electrical demons, but the one that has everyone a little confused is this - on the 1-2 upshift the rpm's will repeatedly surge & drop until you press the gas a little harder. It feels like something slipping & it makes the whole truck "buck". It only does this upshifting from 1 to 2, no other time and if you accelerate pretty hard it doesn't do it as much. Any ideas?

You're expirencing a problem that plagues 42RE trannys. It's most likely a torque converter overun clutch problem. When 42RE trans hesitates to shift, feels slippey, slushy etc, 7 out of 10 times the torque converter is bad. The overun clutch inside the converter craps out, similar to a worn clutch disc in a stick trans. There are simple tests you can do....
*Check the TV (Detent) adjustment...
The TV or throttle valve cable is manually adjustable. This cable determines when the trans shifts via the throttle valve in the valve body. If it's out of adjustment, the trans will not shift properly.
*Stall lag test...
This tests the torque converter stall range and the stator overunning clutch, and tests the holding power of the trans clutches and brakes. Apply your E-brake and brake pedal, put the Jeep in Drive, press the accelerator. Watch the tach, your stall speed should be between 2,000-2,500 RPMs, but no less than 1,500 rpms, and the Jeep will want to move without hesitation.
*Find a good trans shop, or buy your own pressure test equipment...
If you know someone with test equipment that won't try to hose you, and have them do pressure tests on the trans. There are test ports on the trans housing for testing line, governer, front/rear servo port, pressures. Testing any one or all of these ports will pretty much tell you what the problem is. All pressures are consistant if the trans is working properly, and any problems will be reflected in the pressure readings.
**If you find out the trans is bad the interchange for the trans is 1993-1995 Grand Cherokee w/4.0L. Good luck...
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1NASTYZJ
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Joined: 08 Nov 2006
Location: Maryland

PostPosted: Thu Nov 09, 2006 11:51 am    Post subject: Reply with quote

Thanks! That will be a great start! Smile
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