oki have an 86 carbed truck with shifter in trans? i have 4.0-1 gears in it. just got 37 inch mtr`s. need dual cases. i have spare cases. a carbed and an efi. both have different shifter loctions. what do i HAVE TO DO TO PUT IN @ CASES?
Good morning,
What you will have to do may sound a bit complicated.
Modern Toy dual case adapter plates are designed to be as short as possible. This means that using a
forward shifting t/case (where the t/case shifts remotely from the rear of the transmission--like what you have) as the rear (main) t/case is not possible. So in order to put in a dual case unit, you must convert your main t/case--the one where the drive lines will be attached to--to a top shifter (where the t/case shifts directly from the top of itself).
Now you said that you have a couple a t/cases around with different shifting locations. This is good because you will need to use 1 t/case that has its shifter operating from the top (top shifter).
First, you will need to disassemble your top shifting t/case (donor t/case). You will use the front reduction pieces assembling up to the dual case adapter (assuming you order a kit). Now, since your transmission (G52/G54) uses a forward shift t/case--the one you have now--we need to create the dual case unit as a forward shifter since it will be bolted directly behind your transmission. So to do this, we need to swap the forward shift rods from your t/case (4.0:1 geared) and place them in the dual case unit, and use the top shift rods from your donor t/case to place in your main t/case (4.0:1) since it will be behind the dual case adapter plate which can not accept forward shift rods.
Have I lost anyone??
In general, you need to have the following:
G52/54 Transmission > Forward shift Unit > top shift t/case.
If you have a top shifting transmission (1979-83; 1985-1988 EFI[4cyl/non-turbo]), then you would have:
L-series or W56 Transmission > Top shift Unit > top shift t/case.
So what you need to do is convert your 4.0:1 box to a top shift, and use its forward shift rods to assemble your dual case unit as a forward shift.
Regards,
BigMike 8)
