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I have an 1989 5.0 notchback with a new Lentech AOD in it. Also installed with the tranny was a very large tranny cooler (one lentech recommended) . It didn't run hot after the install, but now that the weather has warmed up, it runs very warm on 75+ degree days. It will normally hit 3/4 on the stock gauge in normal driving. It runs that in stop and go traffic, and on the highway.

Just before the weather started warming up, I also installed a set of underdrive pulleys, as well as a few other goodies (intake manifold, egr, throttle body, cai, maf, fpr, etc).

It seems that the combination of pulleys and the extra core in front of the radiator is having an effect on cooling. Has anybody else had problems like this with their upgraded aod? What would you recommend to do to fix this? Will removing the underdrives have any effect?

thanks,
Dave
 

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If you got an underdrive pulley for the water pump, that would slow the pump down and move less water, as well as slow the fan down if you still have the stock piece. That coupled with the extra heat from the trans cooler might cause your temp jump.

Or the crappy stock gauge could be at fault.
 

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RobKong
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1,118 Posts
Moving to the correct forum.

Please keep the 5.0/5.8 Engine Tech Forum limited to engine related topics...
 
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