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I realize 5 years has passed since I started this thread. I revive it now to say I had a GV overdrive installed over the winter and I am pleased with the results.
While it didn't make a diesel pusher out of my 350LE, it certainly made things better.
I can now cruise at 65 mph on the interstate without listening to the 454 scream. I can talk in normal tones to the other side of the coach.
I still get passed on the road, but no one looks at me crazy for driving 55 in a 70 mph zone.
A Allison/Cummins would be great, but considering this was a bolt on improvement I am satisfied and recommend it for those not ready for an in-depth refit of the entire drive train, fuel system, cooling system, dash air, etc, etc, etc.
My 1990 P30 is stock TBI but still had the TH400 3 speed. With only 30K miles I figure there is a lot of traveling to do before engine or transmission rebuilds are called for. And, the lower RPMS will add to useful life.
We'll see.
Regards,
JD
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Jeff & Cindy
'09 27FB Flying Cloud;'82 31 International
'91 350 LE MH; '21 Interstate 24GT
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