t case swap

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Mar 31, 2009 | 12:16 AM

laynejc

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t case swap

What do I need to do to swap a 205 tcase from a 79 f250 into a 79 f150 that had a 203?

Mar 31, 2009 | 09:48 AM

farmerdebruin

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Aight, what your gonna have to do is remove your 203, cross member, driveshafts and transmission out of the F-150. The output shaft on the transmision of the F-150 will be too short. they do not make an adapter for this so you will either need a new output shaft, or you will need to use the transmision out of the F-250. Switching out put shafts will probably cost around $200 to have it done profesionaly.

Also driveshafts are gonna be a problem. I think you can switch the yokes around to make your front driveshaft work, but the rear will be hard. You will need to find one at a junk yard, or try to make one by switching out the rear yokes.

Mar 31, 2009 | 09:50 AM

farmerdebruin

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Also you will use the adapter plate from your 205, and the cross members are the same.

Mar 31, 2009 | 03:15 PM

laynejc

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I am using the tranny and transfer from the 250, I have the front and rear driveshafts from the 250, is the yoke you are talking about the one on the rear of the tcase or the rearend?

Apr 1, 2009 | 11:15 PM

farmerdebruin

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I believe that the yoke on the rear end of the rear drive shaft is the problem child.

Apr 1, 2009 | 11:22 PM

laynejc

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Quote:

Originally Posted by farmerdebruin

I believe that the yoke on the rear end of the rear drive shaft is the problem child.

so what you are saying is that I need to reuse the rear part of my driveshaft?

Apr 2, 2009 | 10:26 AM

farmerdebruin

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yeah because the yoke for the 9 inch axle is a different size, but your 203 drive shaft will be to short, i do not know how to do it though, the driveshaft has to be perfectly centered or else you will wear out the bearings in your rear end and transfercase.

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Apr 2, 2009 | 07:43 PM

laynejc

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Quote:

Originally Posted by justforkicks

take the two t-cases and build a 203/205 doubler... itll have a 1:1 high range and a bunch of ranges in between, down to a 6.6:1 crawling range (i think).

what does it cost to rebuild a 203?

what needs to be done in order to couple them?

what is the gear ratio as it sits?