The writeup for the Chevy in the stickies is great! However, has anyone done a 4L80E to a BOP pattern/torque converter/flexplate? I need to figure out how to do this to a 455.
Any resources out there?
Any resources out there?
CUTLASS 4L80E mated to an Olds
- Thread starter rfpowerdude
- Start date
Yeah, not much. Trying to figure this out for my 70S. I am planning on a bell housing adapter, use 3 bolts on the flexplate, supposedly works. Also the drive shaft is different on the O axle vs a Chevelle with a 12 bolt for length. I should have my Terminator X Max with 4L60E/4L80E harness next week. I just need to find a reasonable used 2WD 4L80E locally that they don't want $1500 for.
NonLS 4l80 has the same 11.5” converter bolt pattern as a t350, t400 etc. TransDapt adapter is .250” thick. The flex plate balance weight is .150” thick so if you have 6 bolt converter 3 bolts can be used and you’ll have plenty of clearance for the one converter mounting tab that aligns with the balance pad. I have the TD adapter. Nice piece. Came with center pilot extension. Longer block dowels would be needed too. I haven’t swapped a 4l80 yet but I did buy a supposedly workin one 4-5 yrs ago just incase. 
I have on the back burner a 4L60E to BOP project, mainly because never did one before and if I screw it up, I will get over it. Plus the bell housing is cracked.
4L80E should be about the same. Cut off bell house and attach the ultra-bell.
Pic attached Is for the LS 5.3 just as an example. BOP unit is available, just haven't found it yet.
4L80E should be about the same. Cut off bell house and attach the ultra-bell.
Pic attached Is for the LS 5.3 just as an example. BOP unit is available, just haven't found it yet.
Yeah the Ultra bell is nice but the Trans Dapt adapter is about $400 less. I used a cheap Ebay adapter when I did the Olds powered 94 Z71, Olds 350 to a 4L60E. I should have went with a better adapter like the Trans Dapt one, less flimsy. It didn't come with the reduced head bolts either.
Last edited:
Yeah I'm not too hip on the prices asked for a piece of cast aluminum.
The ultra-bell style seems the most robust, I looked at trans adapt, haven't used one yet and they do look a little flimsy.
I was looking for 455 for the wagon, nothing around here even as a core. I did find a 403 or I'll just keep with the 350. I have a BOP 400 already for it. I can get 4l80 cores for decent price when available which have been fairly spotty lately.
The ultra-bell style seems the most robust, I looked at trans adapt, haven't used one yet and they do look a little flimsy.
I was looking for 455 for the wagon, nothing around here even as a core. I did find a 403 or I'll just keep with the 350. I have a BOP 400 already for it. I can get 4l80 cores for decent price when available which have been fairly spotty lately.
The Transdapt is 5/16" thick, my adapter was thin tin. I wish there were cheap 2WD 4L80E here. I saw another 2WD 4L80E locally, asking $1100.
Cut the case and bolt up that adapter bell housing. I've seen it once in person when I worked in a machine shop. Empty case came in to be cut down for an adapter bell housing I believe it was going behind some Turbo Ford engine.
I had a stalled 4L80E in my SS for a bit years ago.
I had a stalled 4L80E in my SS for a bit years ago.
Similar threads
