Look at the table here.
http://www.transmissioncenter.net/sp...__va.htm#700r4
The best options still have @ 1% error.
3.73:1 26.6" DIA tires 15T drive with 42T driven = 0.9% error
3.73:1 26.6" DIA tires 15T drive with 43T driven = 1.5% error
3.73:1 26.6" DIA tires 17T drive with 35T driven & 37.5% slow down ratio box= 0.6% error
3.73:1 26.6" DIA tires 19T drive with 36T driven & 50% slow down ratio box= 0.6% error
__________________
1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8
RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.