Question about 2004 Chevrolet Avalanche

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Will not go into reverse/05 chev avalanche

Drive works, but when I put it into Reverse it doesn't move- power mirrors move;then engine just revs.... got it to go once into reverse but chugged, then jerked -then finally reversed-(barely)
drive seems ok - no check engine or lights on-seems to shift fine when driving....we drove home ok...only when we went to back in our driveway!
any ideas PLEASE help--I just bought it(private sale) and I mean just bought TODAY. Do I have a serious tranny problem or linkage etc -- any thoughts would be great - although I cannot tell you much about vehicle as I have only owned it for about 4 hours now.

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  • beal_darcy Feb 05, 2009

    what exactly is the synchro for reverse?
    Am I going to require a new tranny or rebuilt?
    Just trying to get an idea of how much something like this costs
    Thanks from Canada!

  • beal_darcy Feb 05, 2009

    Tranny is automatic -- no synchro for reverse .(not Manual)
    Any other help or suggestions? thanks to all

  • mrguys Mar 17, 2009

    i have a friend of mind that just spend 3 intense days rebuilting my 2005 avalanche tranny. We then installed it and double checked all our connections, filled it up with 7 litres of tranny oil and started the truck.......When we put it in either drive or reverse nothing happened. You don't have to ask if my eyes popped out, just as how far.
    We trouble shooted for 2 hours the pressures are good but the transmission will not engage in any mode. please Help.

  • Anonymous Mar 22, 2014




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There are no synchros in a automatic! And the 4L60E is a 4 speed They do not use this trans in Jeeps either.

A manual trans has synchros but not a valve body as the driver of the vehicle shifts it.

Horrible info...

Posted on Apr 03, 2009

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Chances are you have a transmission problem. If its just reving it means the transmission isn't catching. I would take it to a transmission specialist right away and be sure to call the seller. I would ask for your money back or have the seller pay for the repair cost, which may be a lot. Advice for the future: Always test drive the vehicle so you don't get ripped off.

Posted on Feb 05, 2009

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It's a good bet that the synchro for reverse is completely shot. The linkage is highly unlikely, as if it were mis-adjusted or damaged you would not likely be able to shift into park. A mis-adjustment to that side would cause you to actually be in reverse when it indicates park, so we can rule that option out. Also, the shift solenoid is not a likely culprit in this case since you're shifting upward through forward gears just fine. I hate to say it, but it's pretty likely that synchro. Another possibility, though not very likely, is a plugged region in the transmission valve body. Although I don't think this is probable, it would be the least expensive and easiest to check. To check this, you can drain the transmission fluid, remove the pan, and visually inspect the lower valve body. While you're at it, it might be a good time to chage the transmission fluid filter. If the lower valve body shows no clogging or damage in any of the ports, you will need to disassemble the valve body and inspect the upper region where the actually "brains" of the transmission are. If you're not comfortable with delicate mechanical work, I'd really recommend taking this job to a skilled mechanic. Unless you are working in a very clean area and have experience and patience for working with very small parts, you're likely to have an upset. The valve body consists of many "galleys". Some automatic transmission rely on ball bearings that act as check valves. Others do not. For the most part you can safely remove the valve body without losing parts, but if it appears damaged or clogged and dirty, cleaning it would, again, be best left to a mechanic skilled in transmission work. Not every mechanic is a good transmission mechanic. Even after nearly 30 years of experience I hesitate when it comes to transmission rebuilds because of the specialized tools and amount of time and patience they take. Let me know if this helps, and if you don't find the problem there, we can keep trying.

Posted on Feb 05, 2009

  • Randall LaClaire Feb 05, 2009

    Well, the synchro is just what it implies. A shift synchronizer. It is what allows the turning parts of the transmission to synchronize with each other to allow the shaft which engages each gear to do so without binding and grinding gears. In smiplest form, yes, you would likely require a transmission rebuild or new transmission to solve this problem. As for pricing, it's really hard to say. If you take the vehicle to a speciality shop you're going to pay top dollar for the parts and labor, but you'll have a reliably built transmission. You can buy a used transmission which has been inspected and waranteed for three years (usually) for around $1,900.00 US Dollars. A brand new transmission for the 05 Avalanche is going to be nearly double that amount. To have a mechanic rebuild the transmission will likely run you about $1,000.00 to $1,500.00 USD. I'd have to agree with oip25 on this one and say you would be best off to get a few quotes from some local transmission shops, then contact the seller and see about either getting your money back, or having them pay for repairs.

  • Randall LaClaire Feb 06, 2009

    Just an extra: Automatic transmissions still have synchros. Further, it's becoming more common for reverse gears to have 'em as well. I did some additional research and located a fact sheet from "Motive Gear" that indicates a synchro and pin assembly for reverse. According to their part list and fact sheet the 5th synchro is also the reverse synchro. Not entirely certain how that works but that's what they're telling me. Moreover they listed this transmission as being applied in some newer GM cars and trucks, as well as some jeeps (Yes, I know Jeep isn't made by GM, but that's what they're claiming) Not trying to doubt you, just pointing out that it may be possible you have one of these rare monsters in there. Hopefully this helps more.


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