M38/CJ3A build - planning stage

[Mike Cuff]

Hello All,

I�m just starting to plan the build of an M38/CJ3A/CJ3B that will run 33s and will be used for mild offroading in the UK.� My initial starting point is an M38 chassis, front D44, parts to build a full floating rear HP D44 (F150 center section/Herm the Overdrive Guy full float kit/disc brakes).� �

My first big decision is what engine to use. I have a complete 2001 Chevy Blazer fitted with a Vortec 4.3L V6/4L60E box, however I am concerned about the engine height, it�s just about 32�. Can anything be done to reduce engine height? I�ve heard rumours of fitting an S10 sump? I don�t have a body tub, will probably get a new one from MD Juan (drastically cheaper than the basket cases available in the UK) and so I�ve got choices, that said I am really keen on the M38/CJ3A bonnet look. Used a lot of MD Juan body panels previously when restoring an M201 Hotchkiss Jeep (MB built under license in France in the 50s).

Be great if I could get in touch with somebody who has used a Vortec 4.3L V6, so I can get some measurements etc.

tah
Mike C

[F Bill]

The engine height of 32 inches sounds a bit tall.. Being as it is derived from the small block v8, I don't see it being that tall, unless it has a deep oil pan for a specific application, or a really tall intake setup. I think there is where you'll need to make some adjustments for the height.

Really good motor, that 4.3 V6. Lots of power and rock reliable if it doesn't have the balance shafts. (Which can be removed with a little work..) I've owned and installed several in stock vehicles but never put one in a jeep.... Have you looked at the Novak or Advance adapters websites for any tips? They have documentation for many of the popular swaps...I know I have seen 4.3's in flatfenders.

[MikeB]

Hi Mike C

I have a GM 4.3 v6 in my 52' can gladly give you some measurements if you like.

Mike B

[Mike Cuff]

Hello MikeB,

Sorry for the slow response, got side tracked with another project.� Really appreciate measurements using attached photo as reference when you have time.



Since my original posting, I've got hold of a D44 front axle, bits to build a full float rear D44, a 4L60E with a 23 spline Altas adapter that I hope can be mated to a D300 t/c (possibly with a custom adapter), will be looking into this into December.�

Much appreciated
Mike C

[MikeB]

I'll get those numbers for you ASAP.  I have the D300 with a 3 speed munchie 465 gear box and D44 in the rear. D30 up front, everything fits nicely, a little tight in places but very doable. Only mod needed to clear the motor was a 1" body lift.

Mike B

[Mike Cuff]

Thanks Mike B, look forward to getting measurements.