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Mother-In-Law's 2002 Blazer won't go in reverse. It's parked in the garage right now and she can't get it out without pushing it. I checked the tranny fluid and it's nice and pink and full. I can put it in drive but it won't go in reverse, just sits there and revs. I put it in 4wd (push button on dash) and it does the same thing. She said the other day she came around a corner and she saw the RPMs go up but it seemed like she wasn't going any faster. Is there different linkage in the tranny for drive and reverse? She bought it used and naturally the warrenty is up! Will she need a new tranny or get this one rebuilt?
 

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Since it will go into gear and forward, we'll "assume" the linkage is connected.

Simple test: Shift the tranny into "1" if your shifter has this option. On many transmissions First and Reverse gears use the same bands, the only difference being the shift valve.
Obviously, if your shift selector doesn't have the "1" option, this simple test is useless.

The problem "could" be as simple as a shift valve being clogged by a piece of crud or the tranny needing a new filter ... but it "could" be as expensine as needing a replacement.

New tranny? Replacement that's been rebuilt? Rebuild the current one?
Shop around.

Check factory recall notices. It may be subject to being repaired under a recall ... even if the warranty is up.
(Had this happen on an '85 Ford and have heard of it being the case on other vehicles as well.)
 

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Checking the manual linkage as someone stated is a good idea. First question is if the truck is in park will it stay in place or will it roll? Shifting to 4wd will not change your problem as it sounds definetly trans related. This trans manual linkage actually only engages the park section as everything else is electronically controlled. Moving the shift lever controls an electronic switch which inputs the computer which activates shift solenoids in the trans. The correct combination of solenoids gives you different gears and reverse. It will take someone with knowledge of the system to diagnose your problem. You could also have broken a hard part in the trans from the description you gave of how it revved higher while driving which sounds like it possibly doesn't have all of the gears while moving foward also. If it is internal hard parts in the trans it can definetly be rebuilt. The hardest part will be finding someone that can rebuild it properly and offer you satisfaction for the money spent. Not uncommon for a repair like this to be over $1500. Another alternative if it is internally in the trans is to have a remanufactured unit from a quality rebuilder like Jasper installed. It will come with an excellent nationwide warranty and give you peace of mind if you are keeping the vehicle. You can go to their web site and locate a shop in your area.
 
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