65RFE vs. 8HP weight distribution trivia

[kurek]

I was looking at the towing chart for my truck (RCSB V8/RFE/4X4) and something stood out about the base weights listed there:

4wd RCSB

6 speed - 4916.59 lb
8 speed - 4921.98 lb 5.39 lb heavier

6 speed front axle 2850.86 lb
8 speed front axle 2909.27 lb 58.41 lb heavier

6 speed rear axle 2065.73 lb 53.02 lb heavier
8 speed rear axle 2012.71 lb

2wd RCSB

6 speed - 4738.68.98 lb
8 speed - 4747.98 lb 9.3 lb heavier

6 speed front axle 2697.44 lb 0.14 lb heavier
8 speed front axle 2697.30 lb

6 speed rear axle 2041.24 lb
8 speed rear axle 2050.68 lb 9.44 lb heavier​

On the 2wd there's about a 9 pound difference in weight depending which transmission you get, nearly all of which is given to the rear axle. On the 4wd there's about a 5 pound difference in weight but with the 6 speed more than 50 pounds is shifted to the rear vs. front axle.

My guess is that the transmission cases (RFE vs. 8HP70) differ in length so on 4wd's they shift the engine forward and backward a little to keep the transfer case location & driveshaft lengths the same. That's only a guess as I haven't measured anything to verify.

But that would mean the engine is fore/aft by maybe an inch or two (??) depending which transmission you have - and would that not produce fitment issues for accessories that connect engine to chassis (hoses, cables, air intake plumbing, etc) ?

Just idle trivia on a slow work day in case anyone was interested in this kind of crap.

 

[Wild one]

I was looking at the towing chart for my truck (RCSB V8/RFE/4X4) and something stood out about the base weights listed there:

View attachment 245052

4wd RCSB

6 speed - 4916.59 lb
8 speed - 4921.98 lb 5.39 lb heavier

6 speed front axle 2850.86 lb
8 speed front axle 2909.27 lb 58.41 lb heavier

6 speed rear axle 2065.73 lb 53.02 lb heavier
8 speed rear axle 2012.71 lb

2wd RCSB

6 speed - 4738.68.98 lb
8 speed - 4747.98 lb 9.3 lb heavier

6 speed front axle 2697.44 lb 0.14 lb heavier
8 speed front axle 2697.30 lb

6 speed rear axle 2041.24 lb
8 speed rear axle 2050.68 lb 9.44 lb heavier​

On the 2wd there's about a 9 pound difference in weight depending which transmission you get, nearly all of which is given to the rear axle. On the 4wd there's about a 5 pound difference in weight but with the 6 speed more than 50 pounds is shifted to the rear vs. front axle.

My guess is that the transmission cases (RFE vs. 8HP70) differ in length so on 4wd's they shift the engine forward and backward a little to keep the transfer case location & driveshaft lengths the same. That's only a guess as I haven't measured anything to verify.

But that would mean the engine is fore/aft by maybe an inch or two (??) depending which transmission you have - and would that not produce fitment issues for accessories that connect engine to chassis (hoses, cables, air intake plumbing, etc) ?

Just idle trivia on a slow work day in case anyone was interested in this kind of crap.

The motor sits in the same spot.

 

[Burla]

Oil Thread, the rfe carries about 8 more pounds of oil?

 

[kurek]

I guess it could be the other way around, the transfer case gets moved fore/aft a little for different transmission case lengths? When I installed the OE skidplate and crossmember for the transfer case on my Ram I noticed not only is the skidplate the same part under the transfer case as under the front diff - smart engineering there - it also seems to have an extra set of mounting holes which could line up with 2 different transmission support crossmembers.