Make Your THM425 Transmission Stronger Posted by on Thursday, September 5th, 2013 The THM425 is a heavy three speed automatic transmission developed by General Motors. It is very similar in design to the TH400, with the major exception being the THM425 was designed for front wheel drive vehicles. download Heathkit Hm 102 Manual torrent. Another difference to note between the two transmissions is that all the internal parts spin backwards on the THM425. The transmission was first put into production back in 1966 and remained so through the 1978 model year. download free Applied Calculus Solutions Manual there. It was used in the, Cadillac Eldorado, and the.

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Source:oreilyauto.com All the vehicles that came equipped with the THM425 transmission where large and heavy. This put more than average stress on the internal transmission parts. Let’s look at some things you can do to beef up your THM425. Install a shift kit: A shift kit will provide a few benefits. First, it will increase the transmission line pressure which will help prevent the clutches and bands from slipping.