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I'm showing three bands in the parts book, overdrive, intermediate, and reverse. Nothing listed for first gear. I can't say for certain first does not use the reverse band, but it is not listed that way in the book.
Sounds like the brake band (for reverse) is slipping (not holding). You'll need someone with test gear and the requisite tools to adjust the band - assuming it's got adjustment left. Otherwise you'll need a box overhaul or a new box!
if you have an automatic gear box , then it is very possible that you have reverse band is broken inside gear box , , light will come on because switch for reverse lights may be actuated by shift lever not gears .
there is a foward band and reverse band in auto gerabox's so if you are able to drive forward this gearbox will need to be repaired or replaced .
if manual gearbox , you may find a reverse linkage loose , or gears dammaged in gear box .
good luck hope this helps
It sounds like the reverse band broke. Typically with automatic transmission when you put the transmission in reverse a couple things happen. Usually, the forward clutch engages and the reverse band engages holding the reverse drum from turning, which causes the planetery gears to make the vehicle move backwards. If the band breaks there is nothing told hold that drum from turning and you have a forward gear. The bad news is the trany is going to have to come out to be repaired and usually the reverse drum is one of the first things to go into the trany, so it has to be completely disassembled. Take it to a transmission shop have them check it, hopefully it's something simpler.
When you say "pull" I assume you mean it wont go foward..
1st thing -check the trani fluid while the engine is running in park..
The tranies in these trucks are known to give out.. Reverse is usually run on the 3rd gear band.. It could mean that the band for 1st gear is damaged.. Could also be a vacume & or modulator issue.. Some trani shops give free estimates..
It will probably have to be towed in and checked out. This can be a total failure of forward gears and necassary for knowledgable person to diagnose,< if you decide to two use a dolly that you can rent about anywhere not strap because it can cause even more damage to transmission pulling this way>. It could be simple,but needs diagnosed by someone who can tell you properly.