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Showing results for tags 'bell housings'.
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So, I've had a couple of 4 speed housings (now a total of 4) bell housings that I need to get machined to fit specs for a S13/S14 gear box. The bell housing only changes in the main bearing size (increased), a shift rod diameter and the overall width around the face needs to be trimmed to a uniform 0.48" thickness. The 1 - 2 shift rod on the 71C was increased from 14mm to 16mm. The top shifter rod hole needs to be opened up to just over 16mm. I told the machinist to duplicate the hole in the 71C bell housing but later had to ream the hole slightly larger myself with an adjustable reamer because it was too tight. If you want to use the larger 71C counter shaft bearing like I did, you have to have the lower bearing hole increased from 56mm to 62mm. Again, the hole needs to be slightly over 62mm to allow the bearing to be a snug, slip fit. The counter shaft driven gear on the other hand, will contact the area around the bearing so this needs to be machined to reduce the thickness out to a diameter of about 3.5" or just remove the raised boss around the hole. The thickness in this area was .61"on the 71B, but only .48" on the 71C (about .13" difference). I had the machinist duplicate the 71C thickness (.48") out to just beyond the raised boss. Details are here: http://zhome.com/ZCMnL/tech/240SX5spd/transmission.htm My issue: I have not been able to find anyone in the Chicago or Detroit area who feels confident (and is reasonable $$). Any tips of a good machine shop would be welcome. Thanks, Mike