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Bell housing question

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Old Jan 18, 2007 | 03:59 PM
  #1  
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Lee H
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Default Bell housing question

Which bell housing do I need? I am collecting parts for my 75 auto to 4 speed convertion. I have most parts and I am honing in on the balance. On of the few parts I still need is a bell housing. Can some one please provide me with the GM part number? I have an M21 and a L88 fly wheel which will use a 10.5 clutch. Thanks, Lee
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Old Jan 18, 2007 | 04:32 PM
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Originally Posted by Lee H
............... a L88 fly wheel which will use a 10.5 clutch........


L88 have 11' clucth i belive!
so if you want stock style take a 621 bellhousing
but other number exist! just take a car bellhousing and not a truck bellhousing because on truck have less precise bore to guide gear box!



Ps: correct me if i'm wrong
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Old Jan 18, 2007 | 04:39 PM
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73, Dark Blue 454
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Oddly enough, I believe L-88 and and ZL-1 clutches were the smaller 10.5 incher,..but I believe they used the dual-disc clutches which would have provided more surface area than the 11" clutch and obvously the smaller flyweel saved some weight.

I'm sure somebody can expound.
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Old Jan 18, 2007 | 05:03 PM
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The L88`s used a lightweight 15 Lb flywheel and a 10.5 diaphram pressure plate with a single disc.
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Old Jan 18, 2007 | 05:16 PM
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I`m sure someone will post more numbers but you can use the #403 or #383....NO reason to pay a premium for a #621 or a #444
...redvetracr
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Old Jan 18, 2007 | 05:45 PM
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Default Automatic Set-Up

Hi Lee,
Not to change the context of your post, but I am searching for a good deal on an automatic shift set up for my turbo 400. I need pretty much the whole set-up, from shifter to transmission. Will you be selling these parts?
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