Question about 1996 Chevrolet Suburban

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Reverse works no forward gears

I have the same problem, but when I pull the transmission fuse I can get 3rd manual and reverse only. Also, when I pull the fuse, the pcm is supposed to go into ''limp home mode'' , but it acts like nothings wrong. no check engine light or anything! I took it up a mountain and turned to around, put the fuse back in and when it got up to 3rd gear speed it engaged in 3rd but 1,2, and 4th didn't work. The transmission is recently rebuilt and I just replaced the valve body and tested all the circuits and replaced the pcm. I think the problem lies in why the check engine or check guages light doesn't work as well as the limp home mode. Also the trans would work and go out and work again. like it was a bad connection. I have not found any bad connections. Anyone have a clue. I sure don't.

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    yadayada May 11, 2010

    try live chat

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Ask the rebuilder, maybe a warranty item

Posted on Jul 04, 2009

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Check for loose or broken pins in harness jack or pcm and valve body

Posted on Jul 03, 2009

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Need more info: is manual shift if so 4sp ,5sp or 6sp speed?
or auto w/overdrive ?
2) wont go into gear or selects reverse gear but acts
like no gear?
3) does forward gears work?
~
4) how's the fluids?

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I have a 1998 Oldsmobile Bravada auto trans drive works fine but no reverse


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Was pushing snow and heard aloud ping while in reverse and it quit pulling.all forward gears still work. sounded like a u-joint. believe me i no that sound.i drive it like i stoled it. lol.but thats what...


not sure if this is an automatic or manual transmission 1st (automatic)if all forward gears are still working what it sounds like is that the reverse drum in the transmission has come apart. which will eventually cause the forward gears to start to go if thats the case, the rapir for the reverse drum is internal the transmission will need to be rebuilt. you can just put a reverse drum, but my opinion is there will be more damage and while its out might as well rebuild the entire transmission. you didnt mention if it was 4 wd or not and only rarely have i seen a transfer case cause the same issue, once most recently in a f150 with a manual transmission i was working on the chain stretched so bad it lost reverse but had all forward gears. 2nd (manual) could have lost the reverse synchronizer whic again the trans will need to be repaired either with just a syncro or complete rebuild. hope this helps

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This information is from my genuine service manual. I hope it is of help.
Non-turbo
Turbo
Sedan Wagon
Type 5-forward speeds with synchromesh and 1-reverse
Transmission gear ratio
1st 3.454 3.454
2nd 2.062 1.947
3rd 1.448 1.366
4th 1.088 0.972
5th 0.780 0.738
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Front reduction gear Final
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Gear ratio 4.111 3.900
Rear reduction gear
Transfer
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Final
Type of gear Hypoid
Gear ratio 4.111 3.900 3.545
Front differential Type and number of gear Straight bevel gear (Bevel pinion: 2, Bevel gear: 2)
Center differential Type and number of gear
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Transmission gear oil GL-5
Transmission gear oil capacity 3.5 2 (3.7 US qt, 3.1 Imp qt)

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Hi:

Your transmission has 3 shift rails...
1st - 2nd
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5th- Reverse

If your 3rd gear doesn't work , you have an internal transmission problem, such as a syncronizer, or similar fail... There is not much you can fix, without removeing the transmission.

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Automatic Transmission goes into all forward


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