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I'm just a late bloomer but here goes. The NP 435,atleat mine has an aluminum top cover Non syncro first gear, and YES The T-18/19 are EVERY durable my friend has a twin turboed 6.9 87 F250 sled rig maken 500+HP and 0 trouble ftom his t-18Now clutches are a diffrent story!
Dustin
Hey guys, I am trying to post some pics. I have t18s. My camera keeps taking too good of pics Anyway, the t18 is every bit as good as an np435. They are durable and have a cast iron top, and are (usually) marked with "13 01" somewhere on the case. On my 2wd one it is cast on the tail shaft on the pass. side.
If you do a search for Novak conversions there is a picture under tech info / transmissions that shows all of these together. The T18/19 look the same - I believe the T-19 has two p.t.o. covers versus only one on the T18.