3500HD - 6.5T to gas engine tranny swap question - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 13 (permalink) Old 09-28-2009, 11:45 PM Thread Starter
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3500HD - 6.5T to gas engine tranny swap question

This is my first post in this forum.

Looking at a 93 GMC 3500HD with bad 6.5 Turbo and 5sp manual.

Will a small block 350 bolt up to the driveline? (ie bell housing, flywheel etc)

Looked around the forum and observed opinions not suppporting the 350 engine....but I really want to stick to the swap question. My goal is to build a 3500HD (short wheel base) flatbed for more of a toy. I love the looks of the 3500HD with straight axle and 19.5's.

Have a tune port small block, wiring harness, ecm and MEMCAL programmed for the 40 pulse NV4500 VSS. Since I have -0- diesel experience..I need to know if the SBC will bolt into the 6.5T trucks driveline.

Thanks
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post #2 of 13 (permalink) Old 09-29-2009, 01:56 AM
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Not really but a 454 will drop right in ! tho you could do a 350 by simply swapping out the bell housing & fly wheel . . .

That truck had a 454 option it would be the most cost effective way to and would have way more power then that Diesel i mean glorified high compression gasser with a turbo. . .

350's blow up easy i know i have trashed 7 of them i went to 400's 427's n 454's never had another failed engine again. . .

My vote you 454 it and be done !

Mike

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post #3 of 13 (permalink) Old 09-29-2009, 02:19 AM Thread Starter
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Thanks for the info..like I attempted to point out..I don't want to get in the 350 argument. I have not had any issues with the 350 engine(s) 305 Yes...I'll take a 350 any day. In this part of the country, I see more 454's anf 6.5's going down. (I have an extra 454 in my barn).

You did answer my question, in my case it's more cost effective to go the 350route for my "3500 HD Toy"..you would agree if you saw the small block parts in my barn.
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post #4 of 13 (permalink) Old 09-29-2009, 02:54 AM
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Quote:
Originally Posted by M123KT-450 View Post
tho you could do a 350 by simply swapping out the bell housing & fly wheel . . .
Yes sir i did right there. . .

I know the 350 is a great they go 100's thousands of miles, iw atched it happen time after time.

I don't trust them as they blow up on me within 25-35K miles, tho i could have gotta the only 7 bad 350's ever built but i GOT all 7 of THEM which rubbed me wrong so i personally avoid them. . .

Tho after owning a 6.5-T i wouldn't mind a 350 at least i know whats going to happen ( blow up) and about when (5-7months) . . .

I too am limited on diesel repair experience as the few I've had never really broke . . .

edit:
I do believe the diesel is the same as the Big Block GM which is different then the Small Block GM, I would have flywheel n bell housing on hand.

Mike

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post #5 of 13 (permalink) Old 11-04-2009, 02:15 PM Thread Starter
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Not to beat a dead horse...but will the small block drop in and bolt into the existing 6.5TD cradle ie motor mounts? From my crude measurements..it looks like it will work.

I'd like to bolt the engine in there.... essentially for Winter storage then resume working on it in Spring.

thanks

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post #6 of 13 (permalink) Old 11-04-2009, 06:41 PM
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it should bolt in using 350 motor mounts for your year of truck

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post #7 of 13 (permalink) Old 11-04-2009, 08:44 PM Thread Starter
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Quote:
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it should bolt in using 350 motor mounts for your year of truck
That's what I find confusing, help me understand:

In the old days, the rubber motor mounts were bolted to the engine and the frame brackets were rigid.

Now, the rubber mounts are bolted to the frame and the engine has the rigid "cup shaped" brackets.

So when you say use 350 motor mounts, are you referring to the frame or engine. I was once informed that the rubber mounts on the frame from ie a 1995 GMC 3500HD with 6.5TD will accept big or small block Chevy engines with those cup style "engine" brackets?

thanks

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post #8 of 13 (permalink) Old 11-05-2009, 04:03 PM
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well I was referring to using the motor mounts that attach to the 350 motor instead of the 6.5L.

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post #9 of 13 (permalink) Old 11-05-2009, 06:21 PM Thread Starter
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Appreciate that...now I feel more comfortable doing the swap.

thanks

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post #10 of 13 (permalink) Old 11-06-2009, 04:17 PM
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As long as you use 350 motor mounts for the years of the frame of your truck, you should be fine.

Smoke!!! Smoke!!!! Are you Smoking yet?
2007.5 Sierra 2500HD SLE 6.6L Duramax Extended Cab Long Box Z71 Fass 150/95, Rare Parts G2 hd tie rods, EFi Live, DSP5 a tune from Duramaxtuner.com, MBRP 4" Downpipe back, Edge CTS Insight, Cognito Idler/Pitman Arm Braces, PPE Deep Transmission pan, deep pan filter, Transgo Jr kit
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