In all reality none of what you are expecting. But if you do a lot of heavy towing the low gear in the 6 speed is lower than the 5 speed. As for cruising the top gears are so close that you won't really notice a difference.Some synchronizer problems. But also thinking about things down the road? Pros and cons of the swap. Better pulling? Better cruising? Better both or a waste
Thanks for the link
OD is actually HIGHER on the ZF5 than the ZF6
I respect your opinion on the subject, I guess my views are different.I have driven all 3 of the transmissions listed above. The S47 Zf5 is the best one.
They shift like butter.
Reveres is where it should be.
They dont cost a ton to buy OR fix.
They came in these trucks, they bolt right in with NO CUSTOM parts.
You are looking at ONLY 60 RPM difference in OD
The only plus I see, is they are rated at 50 ft/lb/tq more
O did I also mention you HAVE to run a trans cooler with a ZF6
Do I need to go on? That is just my take on them
You should try a S47-ZF5 then. 1st and revers are WAY lower than the S42I respect your opinion on the subject, I guess my views are different.
I have all three transmissions as well, I don't see a difference in shifting in any of them, except my S47 has a bad third gear synchro.
I'm not too concerned with the price difference, reselling the existing trans takes out most of the sting there.
There is no "right" spot for reverse to me. I have and have had several different transmissions with reverse in different spots.
I'm not really interested in lower cruising speed rpm, most of my driving is 55, with 65 on occasion.
My complaints are with the S42 in my 95. It is pretty much worthless for towing anything over 5k lbs compared to most of my other trucks. 1st gear is too fast and the rpm jumps between gears are too large to keep the engine in a happy spot. My biggest complaint is that reverse is too fast, it seems really hard on the clutch trying to back a trailer in.
As it is, the 95 is the last truck I hook to a trailer which is sad because I really like the truck and would like to use it more. I'm not real fond of custom parts either, but this swap doesn't seem like it needs that much custom work to me.
You must be reading the chart wrong. The zf 5 actually has a CLOSER pattern than the ZF6. The zf6 just has a lower 1st. So that negates that. What else do you like about the ZF6?I realize that, the 97 has the S47. It still has the big gaps between 1-3, that I think make the old 7.3 struggle. Don't get me wrong, I think it would help but if I was to go through the trouble of finding a trans and tearing my truck apart, why not get the best of everything?