identifying a GM diesel engine?

**V8Ian** · 29th July 2009, 07:45 PM

Originally Posted by Pierre

LARC 5 I did my training in had Cummins power, but wouldn't have been surprised to hear of alternate engines.

Pete

555 (triple 5) or more commonly called triple trouble? Basiclly a NA VT 190

**Sprint** · 29th July 2009, 09:07 PM

according to wikipedia the LARC spec 6-71's were a 165hp unit.....

Brian, what would you reccomend re: transmission and differentials? i know where i can source a 2 speed diff from a early/mid 50's chev

**V8Ian** · 29th July 2009, 09:24 PM

Originally Posted by Sprint

according to wikipedia the LARC spec 6-71's were a 165hp unit.....

Brian, what would you reccomend re: transmission and differentials? i know where i can source a 2 speed diff from a early/mid 50's chev

6 ser 9/10/13sp roadranger, they may be hard to find but a 9 ser would do.

**Sprint** · 29th July 2009, 09:32 PM

wouldnt that be a bit of overkill for a 5 ton truck?

**V8Ian** · 29th July 2009, 09:37 PM

Originally Posted by Sprint

wouldnt that be a bit of overkill for a 5 ton truck?

Be the easiest option for finding flywheel housing for the GM.

**Sprint** · 29th July 2009, 09:44 PM

any idea what it'd be like on fuel compared to something like a 7.3L powerstroke V8 from a F350?

**V8Ian** · 29th July 2009, 09:51 PM

Originally Posted by Sprint

any idea what it'd be like on fuel compared to something like a 7.3L powerstroke V8 from a F350?

I believe driven sensibly they can be ok, lots of options to get GMs marching. I've never owned one, ask someone ancient like Brian

**Bigbjorn** · 30th July 2009, 07:51 AM

A 6-71 will chew up and spit out a 610/613 Fuller if you work it to capacity. You need a 9509/910/9513/915. Dont bother with two speed diffs if you have a range change trans. Two speed diffs are Fred Flintstone vintage crap, obsolete by 1960. Flywheel and flywheel housing on automotive spec 6-71 engines is usually SAE #2. Go around some specialist truck wreckers. Fuel usage on my 8V92TA's was comparable with other engines doing the same work. The couple of 53 series I owned were heavy on fuel but I feel in hindsight that this was because they were really too small for the job and were working their rings out just about all the time.

**V8Ian** · 30th July 2009, 07:55 AM

Originally Posted by Brian Hjelm

A 6-71 will chew up and spit out a 610/613 Fuller if you work it to capacity. You need a 9509/910/9513/915. Dont bother with two speed diffs if you have a range change trans. Two speed diffs are Fred Flintstone vintage crap, obsolete by 1960. Flywheel and flywheel housing on automotive spec 6-71 engines is usually SAE #2. Go around some specialist truck wreckers. Fuel usage on my 8V92TA's was comparable with other engines doing the same work. The couple of 53 series I owned were heavy on fuel but I feel in hindsight that this was because they were really too small for the job and were working their rings out just about all the time.

If the 71 is set below 200 hp the 6 ser box will handle it Brian, the hardest thing would be finding one these days.

**Bigbjorn** · 30th July 2009, 08:58 AM

Originally Posted by V8Ian

If the 71 is set below 200 hp the 6 ser box will handle it Brian, the hardest thing would be finding one these days.

That combination is right on the limit of a 600 series capacity. A used or rebuilt box will not be as strong. OK for light work but if you push the power through it regularly you will have a short-lived transmission. 900 series were always put behind a 6-71 for prime mover or dog trailer work. At White Motor we never built anything with a 600 series transmission. Truckies could stuff 900 series so why risk the lighter box to their tender care.

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