Join Date: Aug 2001
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Re: green metallic paint......bad
Both of those Tran will work really well for you. They are both very strong. If you are thinking of the SM420 be sure to look for a later model. As some of the very early ones don't have a reverse light switch. (not an issue for a trail only Jeep)
As you probably know novak makes a kit for the SM456, or 420 to mate to the D300 (great Kit, I put mine in a few weeks ago) You have two options. You can replace the Mainshaft of the trans so that the input splines will mate to your D300. This makes for a stronger set up as the SM465 only has a 10 spline output. However this is the harder of the two, You have to take all the stuff off the mainshaft and put it on the new one. Don't even try this if you don't have a shop press.
The other method is to convert the D300 to a 10 spline input. The D300 is pretty easy to take apart. And you still end up with a pretty strong set up. The D300 input replacement is cheaper than the mainshaft.
All and all the set up is a good one and the low first gear is pretty useful in a trail jeep.
Good luck, let us know what you decide.