Re: NV4500 vs SM456 vs SM420
The original trans in the '92 lost 5th a little over 100k miles. A lot of blued parts when I went in so bought new GM crate. Then I got a '95 and that one broke a shaft or something a about the same mileage. I never tore into it, but it went all at once with nasty noises and no more go. Put a crate in that one,too. Totalled that truck about 15k later. One front corner of the case got broken out, but I saved it. Fast forward to 250k+ and the '92 trans started making chatter and it was a chunk of 3rd broke out. I used the '95 innards in the '92 case...plus a few new parts.
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"BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed"
GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project)
GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling)
Tim
"Don't call me a redneck. I'm a rough cut country gentleman"
R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~
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