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08-30-2020, 10:36 AM
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#1 |
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Registered User
Join Date: Apr 2018
Location: Princeton, MN
Posts: 5
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1993 c3500 6.5 to 8.1 swap ?
Goodmorning fellas
I've got a 1993 chevy c3500 crew cab dually with a 6.5 detroit/4L80E. The truck came out of Texas, NO RUST. I really only use it to pull my 42ft gooseneck race trailer with a 72 c10 drag truck. Ive grown quite fond of the 93 and rather than spending $60k+ on a new truck Ive been thinking about swapping from the 6.5/4L80E to an 8.1/Allison combo to gain some power and reliability. Don't get me wrong the 6.5 runs well but its a dog and from what I understand the bottom end is a ticking time bomb. Just curious if any of you have done this, and if you have what did it entail? Any help would be greatly appreciated, These forums have been a godsend and have yet to let me down. Thanks in advance! |
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08-30-2020, 08:19 PM
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#2 |
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Senior Member
Join Date: May 2004
Location: Binghamton, NY
Posts: 3,453
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Re: 1993 c3500 6.5 to 8.1 swap ?
I'd look into a Vortec 454 and go from there. They can make more torque at a cheaper price than an 8.1. Only 1 company makes stuff for the 8.1, and they are rather proud of it.
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08-31-2020, 01:57 PM
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#3 | |
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Registered User
Join Date: Jul 2009
Location: Space Coast, Fl.
Posts: 1,050
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Re: 1993 c3500 6.5 to 8.1 swap ?
Quote:
__________________
Dad always said, "Son, WISH IN ONE HAND, and ......." -------------------------------------- -------------------------------------- Current toy trucks: '71 GMC 1500 SUPER CUSTOM short/step, orig. dk. blue, 350/700r, ps,pb, A/C '72 Blazer 2wd, ochre & white, 454, tremecTKO 500 5spd. ps, pb, A/C, tilt Last 10yrs of hobby vehicles, had a FEW more in the 50yrs. before these: '66 Plymouth Belvedere City of Miami cop car clone. '70 Nova 406"sb, 13.5-1, solid roller, Brodix, p.glide/t.brake, back halved, 9" Ford, spool 4.88, cage,ladder bar/coilover, 10.5 tire....... SOLD!! '67 C10 short/step side mount spare -- SOLD!! '72 Jimmy 2wd, 350/350, ps, pb, fun driver, lots of bondo & a shiny red paint job..... SOLD!! '69 Nova 350, 4spd, A/C, ps, p.b, ...SOLD!! |
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08-31-2020, 02:57 PM
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#4 |
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Senior Member
Join Date: May 2004
Location: Binghamton, NY
Posts: 3,453
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Re: 1993 c3500 6.5 to 8.1 swap ?
Beauty of Chevy, everything bolts to everything lol. Yes they the same so bolts right up.
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08-31-2020, 04:52 PM
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#5 | |
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Registered User
Join Date: Jul 2009
Location: Space Coast, Fl.
Posts: 1,050
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Re: 1993 c3500 6.5 to 8.1 swap ?
Quote:
__________________
Dad always said, "Son, WISH IN ONE HAND, and ......." -------------------------------------- -------------------------------------- Current toy trucks: '71 GMC 1500 SUPER CUSTOM short/step, orig. dk. blue, 350/700r, ps,pb, A/C '72 Blazer 2wd, ochre & white, 454, tremecTKO 500 5spd. ps, pb, A/C, tilt Last 10yrs of hobby vehicles, had a FEW more in the 50yrs. before these: '66 Plymouth Belvedere City of Miami cop car clone. '70 Nova 406"sb, 13.5-1, solid roller, Brodix, p.glide/t.brake, back halved, 9" Ford, spool 4.88, cage,ladder bar/coilover, 10.5 tire....... SOLD!! '67 C10 short/step side mount spare -- SOLD!! '72 Jimmy 2wd, 350/350, ps, pb, fun driver, lots of bondo & a shiny red paint job..... SOLD!! '69 Nova 350, 4spd, A/C, ps, p.b, ...SOLD!! |
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09-04-2020, 05:48 PM
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#6 |
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driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,692
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Re: 1993 c3500 6.5 to 8.1 swap ?
Don't most marine engines run reverse?
__________________
-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
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09-04-2020, 09:16 PM
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#7 | |
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Registered User
Join Date: Jul 2009
Location: Space Coast, Fl.
Posts: 1,050
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Re: 1993 c3500 6.5 to 8.1 swap ?
Quote:
__________________
Dad always said, "Son, WISH IN ONE HAND, and ......." -------------------------------------- -------------------------------------- Current toy trucks: '71 GMC 1500 SUPER CUSTOM short/step, orig. dk. blue, 350/700r, ps,pb, A/C '72 Blazer 2wd, ochre & white, 454, tremecTKO 500 5spd. ps, pb, A/C, tilt Last 10yrs of hobby vehicles, had a FEW more in the 50yrs. before these: '66 Plymouth Belvedere City of Miami cop car clone. '70 Nova 406"sb, 13.5-1, solid roller, Brodix, p.glide/t.brake, back halved, 9" Ford, spool 4.88, cage,ladder bar/coilover, 10.5 tire....... SOLD!! '67 C10 short/step side mount spare -- SOLD!! '72 Jimmy 2wd, 350/350, ps, pb, fun driver, lots of bondo & a shiny red paint job..... SOLD!! '69 Nova 350, 4spd, A/C, ps, p.b, ...SOLD!! |
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09-08-2020, 01:18 PM
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#8 |
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Registered User
Join Date: Nov 2018
Location: England
Posts: 7
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Re: 1993 c3500 6.5 to 8.1 swap ?
I have a C3500 with the 6.5 and with some fairly inexpensive mods you can make a very dependable engine with great gas mileage. I swapped out the lift pump and wiring, I replaced the pmd with one mounted to a heat sink in the inner fender and I fitted two matching output batteries. The only expensive fix was to have the ecu re-written to bypass the security system which will fail.
Other than that I will be fitting a manual boost and gauges and carrying out regular oil changes. |
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