Product Description
Build your own rebuild kit for the NV3500 / NV3550 manual transmission. For units with 30mm OD countershaft bearing journals. Pick the overhaul kit that matches your case, then add only the parts you need.
Build your own NV3500 rebuild kit: choose the parts that match the transmission on your bench and leave out what you don't need. This builder has 7 option groups and 28 choices, all optional, so the kit holds only what you pick.
What you can choose
- Choose Your Overhaul Kit: BK235CWS Master kit: bearings + seals + gaskets + synchro rings (1-piece 1-2) - 30mm countershaft, early units; BK235C Bearing & seal kit only (no synchro rings) - 30mm countershaft
- Add Synchro ring kit: SRK235F Synchro ring kit, 3-piece 1-2 style - NOT for units with 1-piece 1-2 rings (BK235CWS/BK235C units)
- Add Synchro assemblies & hubs: 404703K 3rd-4th synchro assembly (hub, sleeve, keys) - fixes grinding into 3rd/4th; 404701-3 1st-2nd synchro middle cone (multi-piece ring, each); 404701A Bronze synchro ring 1st-5th (each); 302703-2K Synchro key & spring kit (keys, springs, balls - set of 3); 404643 1st-2nd slider sleeve, 42 inner teeth (bevel toward 1st)
- Add Shift forks & shifter: 404841B 1st-2nd shift fork, 1.950in steel lug; 404842 3rd-4th shift fork; 404843A 5th-Reverse shift fork (NV3500 / NV3550 / GM M50); 404843 5th-Reverse shift fork (NV3500 / GM MG5 - not NV3550 or M50); 404837-1 Fork pivot ball (GM M50/MG5)
- Add Bearings, seals & retainer: 404220A Input or output shaft ball bearing, 80x35x23mm with snap ring; 334240 Input shaft pilot needle bearing; ATNV3500-6A Front bearing retainer (input), 2000-2004 NV3500/NV3550 only - replace if seal bore or sleeve is grooved; 404070A Front (input) seal; 404074 Rear output seal, 65mm OD cone type; 404074A Rear output seal, 90mm OD rubber coated; 404074B Rear output seal, 54mm OD (GM M50 only)
- Add Gears & shafts: 404670E Input shaft (NV3500 / NV3550); 404670B Input shaft, 26 teeth (NV3500); 404670C Input shaft, 26 teeth with 3 spline grooves (NV3500 / 5LM60); 404670D Input shaft, 35 teeth (NV3500); 404583A 3rd gear, 30 teeth, 2nd design; 404674B Cluster (countershaft) gear, 1.180in OD, no groove, 34-28-22-14-43; 404672AA Mainshaft (NV3500)
- Add Small parts: 404001A Small parts kit (snap rings, springs, dowels, counter plug) - already included in master kits; for bearing-only rebuilds
