tom has already told me his 4:10 have a 4 series carriers it was common practice to use a 3 series carrier with a ring spacer when going to 4 series gears. his does not have that so he will have to change. my suggestion offline (tom and i are really good buddies in spite the fact we live on opposite coasts) to tom was to keep the th400, fix the gears (the reason he is changing them is they are howling) and put a gear vendor over drive in. the gears are shot any old way you look at i so figure them a wash. i say to change over to 700r4 probably total is $1000.00 - 1250.00. to do the gear vendor you are looking at $2500.00. bottom line is you get for $1250.00 -1500.00 more a stronger transmission with a separate overdrive with six split speeds forward.the gear vendor is rated for 1200 HP. simply unbolt rear housing of th400 , bolt over drive on, shorten drive shaft and do a little wiring.you end up with a final drive of .75:1
I sure like that idea vs the four speed auto. BTW the 700R4's are well over $1500 if bought new.
www.hannawoodworks.com
