transmission slipping - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 06-06-2014, 08:00 PM Thread Starter Rookie
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transmission slipping

Hi folks,

I just finished installing a new Ford built 7.3 in a 1999 f350 which was a 7,3 from the getgo. Scooted the tranny back during install. Before engine install when I was driving back during purchase tranny was fine, engine was weak tho, Went through the hoops and got her in now engine is fine but tranny has slippage it seems to be kind of all over the place. I did weld some on the exhaust but both batteries were completely unhooked. As far as tranny goes it is bolted up correctly and fluid level is fine and during engine install I didn't unhook the tranny in any way, just slid it back and see no apparent leaks. I should also mention this tranny is a Jasper rebuild and I think still under warranty. I would also add that I installed a new radiator and noticed air cooler was completely choked off with dust and dirt. I blew air through it and was kind of shocked at how bad it was. I mention this because I'm thinking maybe the tranny cooler could be choked off too possibly causing the tranny to overheat and slip but thing is I'm not towing anything and have nothing for weight in the truck. I will be double checking it tomorrow but can't conceive of anything I missed. The transmission won't let the truck go faster than about 45 mph but will be okay but maybe a little hesitant in lower gears, possible thoughts on anything I missed? thanks in advance
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post #2 of 3 Old 06-06-2014, 10:23 PM
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is the speedo working ok? the transmission depends on the rear abs sensor in the rear diff. even if the speedo is working, the sensor could still be giving intermittent signals.

then there is the typical stuff like proper fluid, fluid level, condition of fluid etc. it seems like synthetic fluid will look ok but smell burnt unlike the regular mercon fluid that turns brown when it's burnt.
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danerisfree (06-10-2014)
post #3 of 3 Old 06-10-2014, 06:57 PM Thread Starter Rookie
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Thanks the wire to the VSS was cracked, cut spliced and heat shrink wrapped it and was good to go
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