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Thank you to all the guys who suggested my problem may have been bad seals. It got me thinking and sure enough there are today better seals than what was designed for the M35 back in the 1960s. I installed what you might call a premium seal and the truck hasen't leaked a drop. I'm on the road...

SKF 49927 There is much information on it on the SKF web site. A standard Nitrile seal is good for a temp of 250 degrees, the seal temp will run 30 degrees hotter then the engine temp because of friction. If your deuce is running 200 on a hot day, you are pushing the seal close to the max. The...

I got rid of the flame heater 18 years ago. I have the truck torn down again. I suspect bad seal. I am replacling it with a seal GM used on their 10.4 liter turbo diesels. It will withstand higher internal pressures plus will withstalnd twice the heat of a standard nitrile seal.

been there. On the last seal job I changed the oil and left it 2 qts. low just in case. No differances. I'm starting to think improper oil seal. Talking with the SKF people. Let you know when I hear from them. Robert

Thanks guys for all the imput. I guess I'll just keep driving it untill the clutch starts slipping. Oil is cheap, its just the mess that bothers me.

I'm 83 and in no hurry to tear it down again but I will ck the crank end play if I do. I always ck the oil seal size because people do make mistakes. Rustystud, Cam plug was not leaking. Even if an oil passage plug was leaking, how could the oil get into the bell housing? This is not a tranny...

I bought my 1970 M35 in 2002 with 29000 on the speedo. In 2006 I replalced rear main oil seal at 36000 miles. In 2017 it went from leaking a few drops to a major leak in one day, I couldn't beleive it, when I stopped the engine it drained out of the bell housing vent in a stream, not drops. So...