1. Th400 Gear Ratios

Welcome to Bowtie Overdrives, home of the worlds finest GM Automatic Overdrive Transmissions. Whether you are looking for the evenly geared 2004R or the aggressive first gear (3.06:1) in the 700R4, you are in the right place. Not only will an Overdrive Transmission improve your performance, but it will reduce your fuel consumption by up to 33%. We have everything you need to make the conversion from the older TH350, TH400, and Powerglide to the newer Overdrives. If you are looking to go with more than 500 horsepower, maybe the 4L80E is the right transmission for you. Our knowledgeable staff will be able to point you in the right direction. We offer free tech service during normal business hours, if you miss us leave a message and you will be hearing from us soon.

  • THIS IS AN EARLY EDITION OF TH400 DISASSEMBLY PROCEDURES. The transmission may be mounted in a specialized holding fixture during the disassembly process. In most cases, it is easier to disassemble the transmission on the bench top. The use of the holding fixture is best reserved for.
  • Th400 17 tooth speedometer drive gear: gm # 8629548: $25.00. To order and ship today call 800-999-9555. GEAR VENDORS, INC. 1717 North Magnolia Avenue, El Cajon, CA 92020 Toll Free 800-999-9555. Telephone (619) 562-0060. Fax (619) 562-1186.
  • 46890 TH400 Transmission governor with gear. Competitors Price $29.48. Your Cost $24.96. Our Commitment Transmission Parts USA Our mission is to.
Th400 speedometer Hold down fork
stainless steel
Th400 speedometer housing 34-39 tooth
billet aluminum
gm # 1362294
Th400 speedometer housing 40-45 tooth
billet aluminum
gm # 1362293
Th400 speedometer gear 34 tooth
gm # 9774413
light green
Th400 speedometer gear 35 tooth
gm # 9780387
Th400 speedometer gear 36 tooth
gm # 1359270
Th400 speedometer gear 37 tooth
gm # 1359271
Th400 speedometer gear 38 tooth
gm # 1359272
Th400 speedometer gear 39 tooth
gm # 1359273
Th400 speedometer gear 40 tooth
gm # 1362048
Th400 speedometer gear 41 tooth
gm # 1362195
Th400 speedometer gear 42 tooth
gm # 1362049
Th400 speedometer gear 43 tooth
gm # 1362196
Th400 speedometer gear 44 tooth
gm # 9780470
Th400 speedometer gear 45 tooth
gm # 9775187
light blue
Th400 speedometer housing seal preferred
replacement with spring lip
Th400 speedometer housing o-ring seal
Th400 10mm hold down bracket bolt and
Th400 14 tooth speedometer drive gear
Th400 15 tooth speedometer drive gear
gm # 8629547
Th400 17 tooth speedometer drive gear
gm # 8629548

Th400 Gear Ratios

Neal Chance 10.5' bolt together converter for TH400, all steel with billet steel front cover. Was behind a BBC TH400 with trans brake in heavy 10 second street car, was sent back to Neal Chance through Killer Racing to go through. Planner garden. Street/Strip and Drag Racing TH400’s Stage 1 TH400 – 450 HP/TQ capable. Our Stage 1 TH400 is a heavy duty rebuild with valve body and hydraulic improvements, rollerized rear thrust, heavy duty intermediate snap ring, and OEM pan. 450 HP/TQ capable but proven at much higher HP levels.