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Originally Posted by the_experience03
...The TH475 is another beef part because it uses straight cut gears on the planetaries making it stronger. It is usually identified by a large parking brake drum on the output though the TH400 could be found this way as well. As for 4 speeds...I've never seen a 700R4 in one, but that doesn't mean they didn't find their way into those trucks. I think you're probably more likely to find a 4L80E or an Allison.
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I haven't actually gotten under there and looked at mine that closely, so I was wondering about this myself. Mine is a 4 speed. After Googling pictures of a 4L80E, I think that's what mine might be, but I've only looked at it once so far so I can't be positive about that. It does have a parking brake drum on the output though. I'm really not a big GM fan so I can't tell any of their trannies apart after the TH400s. I would much rather have a fuel injected Ford big block in there with an Allison tranny!
At a job I used to have several years ago, I worked on our company's F700 now and then and it had a carbureted 429 with an Allison behind it. Unreal torque with that setup! It was because of that truck that I ended up putting a 429 into my 2 1/2 ton military truck. I didn't have an Allison laying around so I had to settle for a 5-ton Spicer 5 speed.
Quote:
Originally Posted by Ray_WA
Yup. Yours is a bit longer than mine by about a foot and a half I'd say. I'm very jealous!!!
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I'm not so sure that's a bad thing. Sounds like your P30 is almost exactly the same size as my 51 Chevy. I had a floorplan drawn up for it that would have worked very nicely. Only thing that was holding me back was the ceiling height.