I have a 89 Suburban 2500,350, A/T 4x4., 12 MPG

A friend tells me I can get cheap mil surplus 6.2 Diesel engines.

Can anyone tell me, can I find a manual transmission that will bolt between a 6.2 and my existing transfer case? What (junkyard) vehicles should I look in for it? Will I need to change flywheel on a 6.2 if it originally was mated to an automatic?

I am told I will need a different radiator. What else?

THANKS!

 

Welcome to DB no such thing as a cheap military take out as they are refered to anymore but you can bid on engines and such at Government Surplus Auctions at Government Liquidation I got my CUCV from there for a real decent price and drove it home the day i picked it up and are you sure you have a 350 turbo in that truck if so it is not stock it should have a TH400 or a TH475 and yes if you was to change it to a manual trans you would have to change out the flywheel as a manual also doubles as the pressure plate which has a ring gear for the starter on the outer part of it ,now if it were me I would find a NV4500 and the pedal and all hardware put that in it but you will want to change it from a dual mast assembely to the single mast trust me on that one only differnce in opperation is you would have to get used to holding the clutch in when shutting the truck off as to keep it form backlashing the crankshaft and essentialy snapping said crank oh you would be able to use the same radiator you just would'nt have trans lines hooked up

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Thank you, Mayhem!

It currently does have the TH400 transmission, which won't hold back in 2nd gear,and as of today will no longer go into reverse, so rather than dumping $ into the auto that I hate, this may be the time to go manual,and Diesel if I can find one that I can afford.

Do you know if the military 6.2's have auto or manual-compatible flywheels?

What truck would I find a NV 4500 in? Would it bolt to my existing transfer case?

 

Military 6.2/6.5s are all automatics,you would want to find a 1992 and up trans and ant manual 6.2 flywheel would fit the bill to convert it to a single mast pressure plate. try and save the pressure plate bolts from the 6.2 you will need these as they are about a half inch shorter and use high strenght loctite on these bolts or you will regret it

 

Update!

I bought a 1983 GMC Jimmy with a 6.2 Diesel.

Want to put the 6.2 in my '89 Suburban, which I succesfully "manualized" last Fall with a Getrag 5-speed from an '88 pickup..

Jimmy had A/T, so I now need a real flywheel to replace the flexplate.

Having trouble searching for a flywheel because I do not know what applications had the 6.2 with M/T.

Seems I can find manual flywheels for the 6.5.....Mayhem says it will fit, maybe? Seems '83 6.2 would be "early"..... same flywheel?

About breaking crank when shutting-off... Is it the single or the dual-mass FW that will do this? How can that be? Surely engine torques FW harder on startup than FW will torque engine when engine is defuelled? Surely if I suddenly take foot off accelerator to slow down, governor defuels engine and FW PLUS whole truck sends more torque through crank flange than FW alone on shutoff?

So, what year/make/model donor vehicles should I look for for the best FW for this application?

Other cautions or suggestions?

TIA for your good advice!

 

You need to find out if you have a 1 piece or 2 piece rear main seal.

A 1 piece rear main seal will take the same flywheel as a 93+ 6.5.

A 2 piece rear main seal will take the flywheel for a 82 6.2.

 

Thanks, Racer. How do I t3ll which I have? Looking at back of 3ngine all I see is crank flange, main cap..

 

1 piece rear main encompases the crank flange which is almost flush with the of the back of the block the inside the seal and has a 3 inch bolt circle,if the crank flange looks like a small block chevy cast crank-it is a 2 piece rear main.

here are some pictures of flexplates that show the different bolt patterns:

http://t3.gstatic.com/images?q=tbn:A...bqcqO-fGkYgpjA 1 piece rear main

http://t0.gstatic.com/images?q=tbn:A...Cg1M0HuPsx3MNQ 2 piece rear main

 

Thanks very much for the clarification, Racer!

Mine looks like a 350, with space behind flange and with the dowel pin. So, I gather I CANNOT use a 6.5 FW. Are '82 and '83 the only years for the 2-piece seal and the FW I need...how wide can I cast my net at the junkyards?

How different is the "proper" clutch for this 6.2 FW from the nw clutch I just put in with the manual transmission?

 

Well, I have a flywheel, supposedly the right one, from an '84 C-20, on the way, from a junkyard in Idaho.

My "new" '82 6.2 has vee pulleys, and all the accessories are gone. Any advice about usability of my serpentine pulley stuff from my '89 350? Will holes for all the brackets be there?

My Suburban has an oil cooler mounted between the block and the oil filter. The 6.2 has oil cooler pipes coming out in exactly the same place, but it's part of the block. Can I hook the 6.2's oil pipes up to the same ports the 350's pipes did?

Will 350 clutch bolt to the 6.2 FW?

Thanks for all the help! I'm excited, haven't had a Diesel on the road since my Isuzu P/U frame crumbled.