mimscorp Posted December 24, 2011 Share Posted December 24, 2011 Hi all, I've a 1988 R model w a 350 engine coupled to a 1070 trdl (says on decal in cab) transmission. I've been having problems both getting the truck into reverse and or high range. I've gotten stuck a few times trying to back in places. I found that if the air selector wasn't working that I could pump all of the air out of the truck by repeatedly pressing brakes and then when the pressure got back up to around 20 psi I would be able to get truck into reverse. I've changed the air filter constantly and even put an accessory air regulator on the shift handle which allows me to fine tune the pressure however, the truck still doesn't shift like I want it to. Has anyone had experience with this trans.? is the a air cylinder or something I need to replace Thanks in advance and Merry Christmas to all! Quote Link to comment https://www.bigmacktrucks.com/topic/22302-1988-r686-wtrdl-1070-trtx-1070/ Share on other sites More sharing options...
Rob Posted December 24, 2011 Share Posted December 24, 2011 You need to rebuild the shift cylinders on the top cover of the transmission, and the selectair valve in the cab. They are leaking air from age. If you use PAI parts and supply the labor yourself, there will be less than $50.00 in the rebuild of both cylinders and the valve.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/22302-1988-r686-wtrdl-1070-trtx-1070/#findComment-95274 Share on other sites More sharing options...
leversole Posted December 25, 2011 Share Posted December 25, 2011 Rob, I dont know why you use a thunder cloud with rain as your signature, you are like a ray of sunshine to many of us!!!! Quote Link to comment https://www.bigmacktrucks.com/topic/22302-1988-r686-wtrdl-1070-trtx-1070/#findComment-95369 Share on other sites More sharing options...
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