2.8 to 4.0 conversion Tranny question | Ford Explorer - Ford Ranger Forums - Serious Explorations

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2.8 to 4.0 conversion Tranny question

wm25burke

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Joined
November 15, 2007
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Year, Model & Trim Level
85 Ranger
Hello,

I'm doing a 2.8 to 4.0 swap. The 2.8 is in an '85 ranger with the BW1350 Xfer case.

The 4.0 is coming from a 93 2wd ranger. I know the 2wd M5R1 won't work unless rebuilt with 4x4 mainshaft and output housing.

What years of the M5R1 4x4 version will bolt up to the BW1350 in my '85?

I notice midwesttrans indicates different part no's for various V6's
http://www.midwesttrans.com/transmissions_retail.htm

What's the difference and which M5R1 4x4 version will bolt up to the BW1350 in my '85?

Thanks.
 
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Stic-o

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Elite Explorer
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'91 Navajo '99 XL '16 XLT
is there anything wrong with the trans you have? The 4.0 will bolt right up. 4.0, 2.8 and 2.9 use same bellhousing pattern;)
 
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wm25burke

New Member
Joined
November 15, 2007
Messages
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Year, Model & Trim Level
85 Ranger
is there anything wrong with the trans you have? The 4.0 will bolt right up. 4.0, 2.8 and 2.9 use same bellhousing pattern;)

The existing trans is an FM145. The common noted concern is that the FM145 is too weak to handle the 4.0's significantly higher torque output.

I want to make it as bullet-proof as possible without going broke, hence the M5oD.
 
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