Quote:
Originally Posted by MYBAD66
Hey all I know this is probably a quite popular topic but I'm looking to put a 4bt cummins in the 66 with an sm465 tranny maybe put in dana 40 4.10 geared rear end is there anything in particular I should consider? Cutting the firewall frame etc.
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Hi, I have a 90 1500 swb 4x4, 4bta with 4500 and 342 gears. To do this swap I would not use the 3500 trans, only the 4500 with around 3.42 gears and remember if you use the GM bread truck block to bellhousing adapter you will either have to cant the motor or the trans I think 7 degrees. We normally get 25 to 28 mpg, one time we got 34 in mass, checked the figures 3 times and came out the same. One time we pulled our smaller two axle fifthwheel camp trailer about 100 miles with no negative effects running 55 to 60 mah. Our truck has at least 400K on the 4bt and never been touched. Getting ready to put one in our blazer chalet.