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#743796 Sun May 01 2011 03:44 AM
Joined: Jul 2006
Posts: 23
Wrench Fetcher
Wondered if anyone has done this before? It has a newer Chevy 350 with a turbo 400 attached in it now, so......anyone swim in this pool, before I jump in like a fool? Good part is I have a full metal shop so fab in not a problem. Measurements seem good to fit.
Thanks for your input Jeff

1965k-10man #743812 Sun May 01 2011 05:19 AM
Joined: Jul 2006
Posts: 23
Wrench Fetcher
Forgot to mention that the 4bt has a T-18 (T-19?) attached to it that I was thinking of using, my axles are 3.54. Posi in the rear and a 76 Blazer up front I had rebuilt and geared to match the back so I could have disc brakes up front. Added P/S because i'm lazy in my old age. Jeff

1965k-10man #743862 Sun May 01 2011 03:21 PM
Joined: Jun 2004
Posts: 8,550
It is a pretty easy swap. We ran them in Chevy step vans.
They are noisey, smokey, slugish, & vibrate a lot. It kind of depends on what you want to do with it.

They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.

1972 Chevy c10 Cheyenne Super
Joined: Jul 2006
Posts: 23
Wrench Fetcher
I have a 1971 Airstream that I was going to tow and thought the mileage would be better than my 350, plus I got the entire stepvan for pretty cheap with a good motor and trany. Sluggish and vibrating would be a issue.
Other than that it would be around town and in the hills.
Thanks! jeff

1965k-10man #743882 Sun May 01 2011 05:47 PM
Joined: Sep 2009
Posts: 46
Wrench Fetcher
A 6 bt would be A much better choice and it would be a much more powserfull combo

Superfly #743916 Sun May 01 2011 08:05 PM
Joined: May 2005
Posts: 9,189
For a 1/2 ton the 4bt sounds like a great choice to me.
lots and lots of info and folks happy with their 4bt conversions over at
stop by and have a look.

A 6bt is a fair amount of weight and not quite as simple of a swap in a small truck.


1951 GMC 250 in the Project Journals []
1948 Chevrolet 6400 [] - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
1952 Chevrolet 3800 pickup []
---All pictures []---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-
Grigg #743926 Sun May 01 2011 09:10 PM
Joined: Jul 2006
Posts: 23
Wrench Fetcher
Thanks Grigg, I found the 4btswaps on one of your threads earlier and spent a hour looking through it. Enjoyed your pics!
I got entire step van for about 800 bucks from a friend, the whole thing is in good condition with a recent T-18 rebuild. I do not know much of anything on that trany. It all drives good though.
Just looking for something to cruise with as I am in not much of a hurry when traveling.
Will not alter the outside of the truck in any manner as they are too good looking in my opinion. Thanks for your insight!

1965k-10man #743931 Sun May 01 2011 09:24 PM
Joined: Mar 2011
Posts: 735
Shop Shark
Howdy & Welcome. I'm about to start on a 4BTA conversion myself. The info at 4BTSwaps is excellent and you'll find that engine not only reliable and fuel efficient, but capable of making more hp than most can imagine. I'm going for moderate hp and max torque myself and hope to pair it with either an Allison 5-speed or the new Furd TorqShift 6-speed.

1946 1.5-Ton Chevy Shorty Bus
In the Stovebolt Gallery
More pix on Flickr

All my best --- Tango
Tango #761065 Sat Jul 09 2011 10:07 PM
Joined: Mar 2011
Posts: 735
Shop Shark
BTW --- just bought a running 4BTAA with an Allison 545 bolted up. Next stop...the dyno at Diesel Specialists. Fingers are crossed.

1946 1.5-Ton Chevy Shorty Bus
In the Stovebolt Gallery
More pix on Flickr

All my best --- Tango

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