Original bellhousing is cast # 3858403 with original fork and t/out bearing
New housing is cast # 3899621 and this is what's going into the car. The new fork #3892632 is what the book says, but the new fork has a little different shape. There's less arc, like it's for a thinner package of clutch/flywheel or something (the old fork looks like it has to go around something. Same length/width though.
Also, the bearing the book calls for is shorter. Book calls for #908244 (changes to 19245400 per GM).
Car is 66 Chevelle w/396, new bellhousing is not from car but will be going in.
Any help? Even Jegs shows the same fork# to use.
jim larson said
Apr 25, 2011
Bryan, my original 66 bellhousing is # 3872444 This is the rare one. Later in 66 and 67 they went o 3899621. Don't know about later years. The #3899621 is currently being reproduced with the casting number, so that bellhousing may or may not be an original; but it works on the 66 396 and has been found on original 66 SS cars.
I am not sure if that is the original fork #. The original fork has a little hole in the top that the spring for the push rod goes into. The replacement fork has kind of a slot at the back on the top that the spring hooks into. I will look for the number later if you absolutly need it. I think I have some photos I can send you, I'll look.
If I remember right people have made the mistake of putting in the wrong bearing. I think information is in my 66 chassis service manual, I'll look.
jim larson said
Apr 25, 2011
909422 is the bearing # in my 66 AIM. Doesn't destinguish between BB, SB, etc. Fork and bellhousing installed in engine plant, so it's not in the AIM.
3892632 is what I have for the a fork number up to 70. I am pretty sure the 66 fork had a different number and was a little different as I noted in the way the push rod spring is attached. Can't find the number at this time for the original 66 BB fork.
-- Edited by jim larson on Monday 25th of April 2011 04:18:10 PM
bowtie said
Apr 25, 2011
Thanks for the pics you sent. I think he got it figured out. It was for a customer. He called today to follow up and said after talking to a couple tranny guys that what he's putting in will work, he was also switching clutch sizes and I'm thinking what he had was OK for the one and what he's going with is now also correct.
thanks for the help.
Lost in the 60s said
Apr 28, 2011
All the forks have the same basic shape and will interchange. There is only 1 t/out bearing for a V8 and it's the short one. The I6 had a longer bearing. That 403 bell he has is for a 10.5 clutch versus the 11" for the 621. He could've saved a lot of money by just getting a high end 10.5 clutch setup and using what he had... If you talk to him again, see if he is going to sell the 403 cheap. I'd pick it up for when I do the tranny swap in the Camaro.
Original bellhousing is cast # 3858403 with original fork and t/out bearing
New housing is cast # 3899621 and this is what's going into the car. The new fork #3892632 is what the book says, but the new fork has a little different shape. There's less arc, like it's for a thinner package of clutch/flywheel or something (the old fork looks like it has to go around something. Same length/width though.
Also, the bearing the book calls for is shorter. Book calls for #908244 (changes to 19245400 per GM).
Car is 66 Chevelle w/396, new bellhousing is not from car but will be going in.
Any help? Even Jegs shows the same fork# to use.
Bryan, my original 66 bellhousing is # 3872444 This is the rare one. Later in 66 and 67 they went o 3899621. Don't know about later years. The #3899621 is currently being reproduced with the casting number, so that bellhousing may or may not be an original; but it works on the 66 396 and has been found on original 66 SS cars.
I am not sure if that is the original fork #. The original fork has a little hole in the top that the spring for the push rod goes into. The replacement fork has kind of a slot at the back on the top that the spring hooks into. I will look for the number later if you absolutly need it. I think I have some photos I can send you, I'll look.
If I remember right people have made the mistake of putting in the wrong bearing. I think information is in my 66 chassis service manual, I'll look.
909422 is the bearing # in my 66 AIM. Doesn't destinguish between BB, SB, etc. Fork and bellhousing installed in engine plant, so it's not in the AIM.
3892632 is what I have for the a fork number up to 70. I am pretty sure the 66 fork had a different number and was a little different as I noted in the way the push rod spring is attached. Can't find the number at this time for the original 66 BB fork.
-- Edited by jim larson on Monday 25th of April 2011 04:18:10 PM
thanks for the help.
All the forks have the same basic shape and will interchange. There is only 1 t/out bearing for a V8 and it's the short one. The I6 had a longer bearing. That 403 bell he has is for a 10.5 clutch versus the 11" for the 621. He could've saved a lot of money by just getting a high end 10.5 clutch setup and using what he had... If you talk to him again, see if he is going to sell the 403 cheap. I'd pick it up for when I do the tranny swap in the Camaro.