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4L80E to SM465 swap

J

JdubBurb

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The 4L80E in my 1991 V2500 cracked big time. I am now swapping to an SM465. I got the 32 spline output transmission, hydraulic bellhousing and hydraulic pedals. I have the flywheel, new clutch and all hydraulics as well. What else may I need to do this swap? I’ve seen people go the other way, or to an NV4500, but not much the direction I am. I want to get the truck on the road economically, simply and durably and the SM465 seems to fit that bill, for now.
 
JdubBurb said:
The 4L80E in my 1991 V2500 cracked big time. I am now swapping to an SM465. I got the 32 spline output transmission, hydraulic bellhousing and hydraulic pedals. I have the flywheel, new clutch and all hydraulics as well. What else may I need to do this swap? I’ve seen people go the other way, or to an NV4500, but not much the direction I am. I want to get the truck on the road economically, simply and durably and the SM465 seems to fit that bill, for now.
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You probably will end up doing some work at the cross member and for driveshafts

I’m presuming you have the adapter on the SM465 that goes to round pattern?
 
Yeah, the trick will be the adapter - round pattern? If so, tall or short style?
 
Fyi, the trans hump should have the "template" embossed in it for you to see where to cut / drill.
 
Actually, since he didn't mention the tcase I figured he was keeping the 241. Round pattern 205's can be rare and expensive so I didn't think that would be a part of a cheap trans swap. Plus this is a VSS truck.
 
nvrenuf said:
Actually, since he didn't mention the tcase I figured he was keeping the 241. Round pattern 205's can be rare and expensive so I didn't think that would be a part of a cheap trans swap.
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I don't know, is it possible he had a 205? Or was that only one tons?
 
I think the 4l80 is 1.75" longer overall so you'll need driveshafts.
 
I'd measure the trans plus adapters. I read a theory once that all the trans / adapter combos from '85+ placed the tcase in the same spot. It kind of makes sense since the 400 / 4l80e adapters are real short vs the strangely long adapters for the 4spd. I mean, if you're building from scratch and there's no longer a drive sleeve why is the 4spd adapter almost a foot long?
 
nvrenuf said:
I'd measure the trans plus adapters. I read a theory once that all the trans / adapter combos from '85+ placed the tcase in the same spot. It kind of makes sense since the 400 / 4l80e adapters are real short vs the strangely long adapters for the 4spd. I mean, if you're building from scratch and there's no longer a drive sleeve why is the 4spd adapter almost a foot long?
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That’s what I hoped they did. It seems easier for manufacturing reasons, but I will have to see once it’s in place.
 
JdubBurb said:
The 4L80E in my 1991 V2500 cracked big time. I am now swapping to an SM465. I got the 32 spline output transmission, hydraulic bellhousing and hydraulic pedals. I have the flywheel, new clutch and all hydraulics as well. What else may I need to do this swap? I’ve seen people go the other way, or to an NV4500, but not much the direction I am. I want to get the truck on the road economically, simply and durably and the SM465 seems to fit that bill, for now.
Click to expand...
Don’t forget the pilot bushing.
 
Didn't think about the 4l80 241 adapter is much shallower than the 205s adapter. That's where my difference came in that made my combo a pain. You might have no issues actually
 
It looks like wiring-wise, I’ll need to bypass/modify a safety switch or two? And, ideally get a new chip for my ecu?
 
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