i was looking at the toyota svc manual pdf, the differences pictured were 2wd vs 4wd & prerunner leaf springs. the 2wd springs were bushing end to bushing end. where, the 4wd springs have a part of a leaf coming up and arround foward, of the front, bushing end....

is that a physical difference you're looking for.
your parts guy should pe able to pull up a parts list diagram, you could look at

 

Jeffry, thanks for the input. Yes, the physical characteristics is what i am trying to determine. If the end of the leafs on the 4x4 and prerunner have that additional length that must be one of the contributors for the leaf not fitting the standard non 4x4 (5 lug) rear differentials. The snow is melting off and today I am going to get under the truck and take a look to determine possible clearance issues.

Unless you have the prerunner or 4x4 (6 lugs) package on your standard cab, you have a spring under axle leaf pack. There are two pack types (excluding TSB packs), the pack for the 5 lugs and the pack for the 6 lugs.

Yes exactly, it is the spring under pack style and a 5 lug. Do you happen to know if it is a length difference for the different spring packs (spring under or spring over axel)? If it is the number of leafs per pack, I might be able to get them to fit.

 

Unless you have the prerunner or 4x4 (6 lugs) package on your standard cab, you have a spring under axle leaf pack. There are two pack types (excluding TSB packs), the pack for the 5 lugs and the pack for the 6 lugs.

 

From what Deaver told me, the length is the same. The count and material characteristics is what differs though (spring rate, and load).

 

4x4 leafs will fit a 2wd mini. It is alittle firmer ride (nontsb) and about an inch drop. I guess the tbs is same height and a little firmer.