New Gears for a 5.4
#16
10-02-2015, 10:00 PM
I run true 35" tires on my 2V V-10 EX, it has the 4R100 but both it and the 5R110 share the same OD ratio. With my 4.88 gears I turn 2400 RPMs at 70 MPH in OD, the combination of the 35"s and 4.88 gears nets an effective ratio of 4.39. Our Ex is our tow rig, we pull an 11k TT and use OD for 95% of our towing miles without issue. The change from the stock 3.73 gears to the 4.88 was like getting a new truck, the higher RPMs allow the trans to stay in OD at speed while climbing grades. The deeper gears improved our towing mileage from 6.5 to 7.5 MPG up to 8 to 9.25 MPG and only cost me about 1 MPG while running unloaded on the highway. Pickup and drivability is much better (and more fun!) with the deeper gears.
#17
10-03-2015, 08:35 AM
The OP gave me the impression he had a 4r100 when he referred to the tranny shifting "non stop" in and out of Overdrive, thinking he had an OD button, not a tow haul unit.
I know Mark has talked about not necessarily using the tow/haul mode with the 5r110 when hauling or towing, but don't recall seeing his approval of heavy towing in OD with the 4r100.
Would like to re read his thoughts if you have that thread?
I know Mark has talked about not necessarily using the tow/haul mode with the 5r110 when hauling or towing, but don't recall seeing his approval of heavy towing in OD with the 4r100.
Would like to re read his thoughts if you have that thread?
#19
10-03-2015, 04:54 PM
Cargo Master
#20
10-03-2015, 07:39 PM
Lead Driver
Boy, I wouldn't be towing in OD with that much weight unless it's a tow/haul setup.
When I pulled with my 4r100, i'd usually pull in 3rd and manually downshift into 2nd at about 52 mph to keep it from shifting back and forth. I wasn't comfortable pushing that OD with that much weight.
After towing with a 7k boat and a 10k toy trailer for years, 320k later I'm still crossing my fingers. Changing ATF regularly too.
When I pulled with my 4r100, i'd usually pull in 3rd and manually downshift into 2nd at about 52 mph to keep it from shifting back and forth. I wasn't comfortable pushing that OD with that much weight.
After towing with a 7k boat and a 10k toy trailer for years, 320k later I'm still crossing my fingers. Changing ATF regularly too.
The OP gave me the impression he had a 4r100 when he referred to the tranny shifting "non stop" in and out of Overdrive, thinking he had an OD button, not a tow haul unit.
I know Mark has talked about not necessarily using the tow/haul mode with the 5r110 when hauling or towing, but don't recall seeing his approval of heavy towing in OD with the 4r100.
Would like to re read his thoughts if you have that thread?
I know Mark has talked about not necessarily using the tow/haul mode with the 5r110 when hauling or towing, but don't recall seeing his approval of heavy towing in OD with the 4r100.
Would like to re read his thoughts if you have that thread?
#21
10-03-2015, 09:09 PM
Why not? What happened to it?
You don't remember correctly.
Both the 4R100 and 5R110 have only one overdrive gear. That ratio is 0.71:1.
4R100 ratios
2.71:1
1.54:1
1:1
0.71:1
5R110 ratios:
3.11:1
2.2:1
1.54:1
1:1
0.71:1
Both the 4R100 and 5R110 have only one overdrive gear. That ratio is 0.71:1.
4R100 ratios
2.71:1
1.54:1
1:1
0.71:1
5R110 ratios:
3.11:1
2.2:1
1.54:1
1:1
0.71:1
#22
10-03-2015, 09:36 PM
The OP gave me the impression he had a 4r100 when he referred to the tranny shifting "non stop" in and out of Overdrive, thinking he had an OD button, not a tow haul unit.
I know Mark has talked about not necessarily using the tow/haul mode with the 5r110 when hauling or towing, but don't recall seeing his approval of heavy towing in OD with the 4r100.
Would like to re read his thoughts if you have that thread?
I know Mark has talked about not necessarily using the tow/haul mode with the 5r110 when hauling or towing, but don't recall seeing his approval of heavy towing in OD with the 4r100.
Would like to re read his thoughts if you have that thread?
I indicated no overdrive because his tow/haul doesn't lock out the 6th gear. The op's original post discussed locking out the overdrive, hence the reason I thought he had a 4r100.
Can you reply and clarify Coop's 13th post about not needing to lockout OD when pulling, because of the cooling circuit?
#23
10-03-2015, 09:39 PM
I misspoke r2.
#25
10-03-2015, 09:55 PM
#26
10-04-2015, 10:15 AM
I'd definitely go with 4.88's if you are running 35's, as that's what I run in mine and I've been pleased with it. The 5-Star tuner is great to have as well, because it has towing/eco/performance settings for whatever octane fuel you like to run (plus you can change the tire size setting to get speedo accurate again). I burn 87 octane and leave mine set on the performance setting, it tows just fine there (also have headers, y-pipe, and AFE air intake). Cruising at 55mph the engine hums just perfect at 2k rpm's. It's fairly hilly around here, so I leave my OD off when towing.
#27
11-10-2015, 11:55 AM
Junior User
#28
11-10-2015, 02:20 PM
Tuned
It is a no brainer. Go with the 4.88's.
Due to the fact that we have stock 31.5" tires we went with the 4.30's, but if I had it to do over again we'd go with a 4.88 due to the fact that we're towing heavy about 80% of the annual mileage that our truck is driven.
Given the fact that you're towing heavy much of the time and have 35" tall tires I'd even consider 5.13's. Sounds crazy but towing heavy most of the time with the tall tires I'm thinking 5.13's wouldn't be too much gear.
Due to the fact that we have stock 31.5" tires we went with the 4.30's, but if I had it to do over again we'd go with a 4.88 due to the fact that we're towing heavy about 80% of the annual mileage that our truck is driven.
Given the fact that you're towing heavy much of the time and have 35" tall tires I'd even consider 5.13's. Sounds crazy but towing heavy most of the time with the tall tires I'm thinking 5.13's wouldn't be too much gear.
#30
11-10-2015, 03:01 PM
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