Cummins 4bt or 6bt Swap
10-24-2012, 08:45 AM
#51
Originally Posted by k9duke
2200 miles on the 6 bt as of this morning. Hand calculated at 26.6 hwy and 22 in town. I use it mostly for comuting 45 miles each way mostly hwy miles. I run it at 70 mph and am turning 2100 rpms. I know these are designed to run wide open all day however, I think I'm going to swap my 3.55 gears for 3.08 . What do you guys think? I think that should put me somewhere around 1850 rpms.
10-25-2012, 06:38 AM
#52
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No, it all depends on how much money and skill you have...its alittle smaller in the 97 and u will deff need to do the straight axle swat but totally do able. There are a couple on you tube..I think farm boy did a 97. Search it..
10-25-2012, 10:39 AM
#53
Originally Posted by k9duke
No, it all depends on how much money and skill you have...its alittle smaller in the 97 and u will deff need to do the straight axle swat but totally do able. There are a couple on you tube..I think farm boy did a 97. Search it..
10-26-2012, 06:19 AM
#54
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I have not done one, but I would think the 4 bt would be ok...with the 4 bt it is not even really the weight that concerns me its the vibration. I've seen one vibrate a jeep to death.. and as 4 bt are beccoming a lot harder to find and $ way over what a good 6bt would cost I've noticed a lot of guys going with the Isuzu or mitz 3.9 ....
01-29-2013, 06:24 AM
#58
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well wat engien suld i go with for a 1990 F-150 XLT manual trasmition, i got a 302 in it now but wen it get's kild or wen i see i got the $$ for a diesel engine i wold like to tri it out just i might need to see more how to videos and book but if it wold be under 3,000$ i just might consider adding it to my restoration make a old nice truck into a new fuel efficient truck wold be nice im just going to play in mud and travel to work and school with it so i don't need the high HP so any suggestion's im also adding a 4" suspension lift if it help's,
02-01-2013, 07:33 AM
#59
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well wat engien suld i go with for a 1990 F-150 XLT manual trasmition, i got a 302 in it now but wen it get's kild or wen i see i got the $$ for a diesel engine i wold like to tri it out just i might need to see more how to videos and book but if it wold be under 3,000$ i just might consider adding it to my restoration make a old nice truck into a new fuel efficient truck wold be nice im just going to play in mud and travel to work and school with it so i don't need the high HP so any suggestion's im also adding a 4" suspension lift if it help's,
Well you need to do some research. A 4bt will be a lot harder to find and about 2x the money. And trust me it well shake the truck apart at some point but will work with a lift. The 6bt is cheaper, but I'm not sure how long things will last lifted. If its not your dd then I say go for it. Since I'm on ill give and update. 12000 miles on swap and 4k since 3.08 gear change. Gas mpg didn't improve much at all but much better on the highway. Put it on lift yesterday and all is good, no play on any steering or supination parts at all. I do have a slight slave bearing rattle in nuteral but I'm told that's normal. Pulled the heavyset load of the swap yesterday, a 236 bobcat on 16 foot trailer with trailer brakes of corse. Pulled it with 0 problames! I'm putting the bobcat motor in a restored 95 Nissan hardbody so ill keep you updated on that swap soon. Shooting for 42 mpg on that swap.
