I have a 1998 4.3 liter K1500 w/ a 4L60e tranny that has lost reverse but all forward gears are working. What would cause this & can it be repaired?

If you search the internet you can find a 4L60E cheaper than repairing the one in the truck i did

The cause of catastrophic failures is usually pretty tough to pin down. In most cases the transmision can be rebuilt.

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

lotsa miles? best to have tranny serviced soon!

It's either your servo, or your bands.
Either way, the tranny needs a good cheap shop repair.
I'd just get a warrantied salvage yard tranny if I were you and save a few hundred bucks.

Hello, this is caused by a bad sungear inside the transmission. the transmission will need to be removed and troned down to repair this problem

check tranny fluid.if fluid level is correct.change fluid and filter if its been a long while.if it still wont go into gear.your tranny oil pump is worn.and the forward clutch seals and drive plates worn.

HI, It may seem obvious, but sometimes overlooked.... have you checked the oil level, as low oil can cause some strange things to happen! My 96 4 liter would be reluctant to move sometimes, but after I topped it up, it has been fine.

You will need to get the Tranny Shift Kit Inspected for Shifting Ball Slippage. Should not be a Big Repair unless it messed up the Clutches inside the Tranny.

????? manual or auto tranny if its an auto check the tranny