| Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | The old style bellhousings are a pain in the neck to R&R, need to remove all the engine mounting bolts through the retainer hole, a REAL pain if the engine is stuck. There is a gentleman in WA who makes an adapter to bolt a modern GM bellhousing to a 235/270/302 etc series. Look at Inlinersinternational, forgot his name.
However, if going 292, etc., the NP-540 series 5 speed as was already mentioned, is a great choice, nice close ratios, bolts to any GM bellhousing w/ 5.125 retainer hole, get the one with the short input shaft, few new parts available. Some were available w/ OD, however, at the expense of a big gap in ratios.
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
| 
