I have located the elusive 4L80E/NP205 combo available only in 1991 V3500 crew cab duallies (7.4L). The seller wants high dollar for the transmission. My question is: Will the 4L80E from a 1991 3/4 ton Suburban (5.7L) bolt up to this NP205 or does it have a different output shaft? I ask because the Suburban transmissions are more common than the duallies and I can pick these up cheaper. Thanks.