Question about 1996 GMC Sierra

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I put my trans. into reverse and it screamed than made a sound like a bucket of bults and now I have to shift my forward gears manually. Reverse quit. What happened?

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  • 139 Answers

Hello,
It sounds like your transmission has broken the planetary sun shell. If it has you would also have no 2nd or 4th gears. Its not a hard repair but it will be more costly if your driving your vehicle as metal will be damaging other components.
I hope this helps.
Roy

Posted on Nov 16, 2009

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Posted on Jan 02, 2017

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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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Hello. As you know, the transmission is one of the more sophisticated components in any auto. It takes the most transmission pressure to engage reverse, third, and fourth gear in an auto tranny. In an auto tranny, the shifter is connected to a linkage that manually shifts between the different gears in the transmission. When you shift into reverse, all transmission pressure is concentrated to engage reverse. When you shift to drive the transmission will operate normally, building pressure until it can shift into the next gear. With third, second, or first gear selected it will lock out all higher gears (Unless the TCU detects overrevving of the engine, in which case it will override gear selection and upshift to avoid engine damage). All the TCU does in a modern auto tranny is control shift points. Years and years ago, shifting was controlled by a spring attached to the gas pedal. When the gas pedal was depressed, the spring would expand. As tranny pressure grew, the spring would become compressed until it was fully compressed, engaging the next gear. The harder you stepped on the gas, the longer you went until the tranny shifted. In modern transmissions the TCU dictates shift points, and not much else. The TCU will also control when the torque converter will lock, but that's where it's duties end. The problem with engaging reverse is either a linkage issue, or a problem with the pump not building enough pressure to fully engage reverse.

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