Parts for the

New Process 435 Transmission

The NP435 has proven to be one of the best transmissions ever built. Their unique design influenced a generation of transmissions to follow.

The Master Kit

NP435 Transmission Master Rebuild Kit

Our NP435 rebuild kit is like no other on the market. They are informed and curated by the hundreds of builds we have done on these in our own shop. Included are all the gaskets, synchros, bearings, spacers, shims, shoes, pins, retaining rings, seals and selective shims needed to do a proper rebuild. Additionally, our included instructions are second to none.

Top shifter cover rebuild kits are sold separately. See them under Related Products, below.

  • Kit, rebuild, master, NP435 transmission, Ford version

  • Kit, rebuild, master, NP435 transmission, Dodge version

  • Kit, rebuild, master, NP435 transmission, ball bearing input version

Rebuild Requirements

It is common for our customers to do top-level rebuild work, using good methods and by following our included instruction guide.

We suggest the rebuilder have access to a set of snap ring pliers and a small arbor press, in addition to standard shop tools.

A terrific online guide to help one size up an NP435 rebuild has been written by Four Wheeler's Verne Simmons. See it here.

Shifter Cane Selection

NP435 top cover height

NP435's have two available finger lengths, one for the shorter, long throw top cover, and one for taller, short throw top cover. Choose you finger length accordingly when selecting a new stick in Related Products, below.

Related Products

Billet PTO Cover
Shifter Retention Kit, SM420, SM465, T176, NP435
NP435 Gaskets Kit
NP435 top shifter cover rebuild kit
NP435 Shifter Stick
NP435 Shifter Stick
NP435 Shifter Stick
NP435 Shifter Stick

NP435 Exploded Diagram


For your reference, all asterixed * items below are included in our master rebuild kit, above.

Items indicated with a double asterix ** below are not available singly, but are included in our master rebuild kit, above.

Items indicated with a triple asterix *** below are not available singly, but are included in assembly #25 below.

Items indicated with a "" are not available singly, but are included in the Small Parts Kit, #A below.

A. Kit, small parts *, #SP291-50
1. Bolt, front input retainer
2. Retainer, bearing, front input
3. Gasket, front input bearing retainer *
4. Seal, oil, input shaft *
4a. Ring, snap, retaining, front input shaft *‡ (Uncommon & early ball bearing version only)
4b. Bearing, ball roller style (rare: GM & early Dodge / Ford only), #643721
4c. Slinger, oil, input shaft bearing
5,6. Bearing, Cup, tapered roller, front input (common) * #88649_88610
7. Shaft, input (or main drive gear), #WT291-16J
8. Bearings, needle roller, mainshaft pilot (14) *
9. Washer, retaining *‡
10. Ring, snap, retaining*‡
11. Bearing, drawn cup, needle roller, closed end, cluster, front *, #C4TZ-7118-A
12. Plug, drain / fill, #PP627-100
13. Bolt & lockwasher
14. Cover, PTO port
15. Gasket, PTO port cover * #T9150
16. Washer, thrust, cluster shaft *‡
17. Gear, cluster, countershaft
18. Bearing race, thrust, cluster gear **
19. Bearing, thrust, needle rollers, cluster shaft, rear *‡, #2507996
20. Gasket, rear, countershaft retainer *
21. Bearing, needle roller, caged, countershaft rear *, #B3216
22. Retainer, countershaft rear bearing, - New, billet version #C95734-N
23. Bolt & lockwasher
25. Assembly, synchronizer, 3rd - 4th, includes aluminum rings & slider, one-piece bonded style, updated *, #AWT275-2_5B
24. Plate, synchronizer, 3rd-4th, outer steel (Only Used Synchronizers Available), #WT258-14
26. Ring, synchronizer, 3rd-4th, aluminum, earlier separate design* Unavailable. Use upgraded #25, above
27. Slider, synchronizer clutch, 3rd-4th, earlier separate design*, #WT275-15
28. Ring, snap, retaining, 3rd-4th syncrho hub (early ball bearing input design only) *‡
29. Bearing, thrust, needle rollers, 3rd-4th synchro hub face (later, front tapered bearing version only) **
30. Hub, synchronizer, 3rd - 4th gear
31. Shims, syncrhonizer assembly, 3rd - 4th gear *‡, #69241B
32. Gear, 3rd
33. Ring, snap, retaining, split, 2nd gear *‡
34. Ring, snap, retaining, 2nd gear synchro ring *‡, #WT291-21
35. Gear, 2nd
36. Spring, flat, coil, 1st-2nd gear syncrhonizer
37. Ring, synchronizer, 1st - 2nd, aluminum w/pins, #AWT291-83
38. Shaft, main, - Novak carries various good used versions. Contact us with your application.
39. Gear, 1st & reverse, slider, 37 tooth, #WT291-12
40. Spacer, mainshaft bearing, #96187
41. Bearing, mainshaft, rear, #6308N
42. Gear, speedometer drive (2wd models) varies
43. Gasket, rear, tailhousing / adapter *
44. Tailhousing (2wd) or Adapter (4wd), rear output, - Novak carries various good used versions. Contact us with your application
45. Bolt & lockwasher
46. Seal, oil, rear output
47. Nut, mainshaft yoke, 1" x 20, 1-1/2" socket (some models)
48. Ring, snap, retaining *‡
49. Washer, needle bearing retaining*
50. Bearings, needle roller, reverse idler gear (68) *(some models only)
51. Washer, needle bearings separator * (some models only)
52. Race, inner, needle bearing
53. Gear, reverse idler, #AWT291-10C
54. Shaft, idler, reverse, #WT258-35A
55. Plate, lock, reverse idler
56. Bolt & lockwasher

Transmission Shifter Control Housing Top Cover Kits & Components


For your reference, all asterixed * items below and shaded in red on the above diagram are included in our top cover small parts kit #SP291-50Y. Diagramed items shaded in green are in our #SLR-176K shift retention kit.

Items indicated with a "" are not available singly, but are included in the top cover small parts kit, #A below.

A. Kit, top cover rebuild (see #SP291-50Y, Related Products, above)
B. Kit, shifter retention (see #SLR-176K, Related Products, above)
1. Knob, shifter, #K103
2. Nut, jam, 3/8-24
3. Boot, mini, shifter tower housing
4. Cap, retaining, transmission shifter stick
5. Washer, domed, shifter stick seat
6. Spring, shifter stick seat
7. Stick, shifter cane (see, adjacent)
8. Pins, shifter stick alignment *‡
9. Plugs, expansion, shift rail bores *‡
11. Bolt, shouldered, precision alignment
12. Gasket, top cover (available with gasket kit only), WT291-55
10. Switch, reverse lights, 4S-18T
13. Fork, shifter, reverse
14. Pin, roll, shifter interlock *‡
15. Plunger, shifter interlock, reverse lug
16. Spring, shifter interlock, reverse lug *‡
17. Gate, gearshift reverse, front
18. Clip, C-style, reverse shift lug plunger *‡
19. Pin, roll, shifter interlock *‡
20. Interlock, shift rail *‡
21. Spring, shifter poppet *‡
22. Ball, shifter poppet *‡
23. Rail, shifter, reverse
24. Rail, shifter, 3rd-4th
25. Interlock, shift rail *‡
26. Spring, shifter poppet *‡
27. Ball, shifter poppet *‡
28. Pin, roll, shifter interlock *‡
29. Fork, shifter, 3rd-4th, #WT291-23A
30. Insert, shoe, shifter, 3rd-4th * #993549
31. Pin, roll, shifter interlock *‡
32. Fork, shifter, 1st-2nd
33. Insert, shoe, shifter, 1st-2nd * #996969
34. Gate, shift rail, 1st-2nd
35. Pin, roll, shift rail interlock *‡
36. Spring, shifter poppet *‡
37. Ball, shifter poppet *‡
38. Rail, shifter, 1st-2nd
39. Interlock, shift rail *‡