I'm confused about towing capacity - Page 2 - JeepForum.com
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post #16 of 32 Old 07-17-2017, 01:41 AM
Timo_90xj
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Quote:
Originally Posted by AlamoJeeper View Post
The factory claims that '98 ZJ's had better transmission fluid coolers in the radiator so didn't need the transmission fluid cooler in front of the radiator. An auxiliary transmission fluid cooler is probably good insurance if you are going to be doing much towing.
That's what the factory claims.

In reality, '98 V8s (and probably the same with 4.0) do NOT have enough cooling capacity for the transmission doing city traffic. Even in cooler climates the transmission can get too hot in city traffic during summer, and when towing or wheeling in just about any temperature.

An auxiliary tranny cooler is a must for the '98s if towing any loads, and it is highly recommended for just normal daily driving as well.


1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...


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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

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post #17 of 32 Old 07-17-2017, 11:58 AM
mkm5
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Well, towing with my stock 5.9L ZJ has not been anywhere near as comfortable as with my stock 2008 4.7L XK which had trailer sway control.

With the XK, you couldn't hardly tell there was anything back there, but with the ZJ, you never forget the boat is back there; starting, stopping, curves, bumps, etc.

Ratings aside, the ZJ is very outdated when it comes to towing, in my humble opinion!

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post #18 of 32 Old 07-17-2017, 12:03 PM
kg6mov
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A ten year newer vehicle with a completely different suspension tows better than the ZJ? Amazing.


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1984 F250, 460 BB, T19, work truck/future tow pig
1987 Mercedes 300D Turbo, the diesel daily, 30mpg in style

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Originally Posted by Texas ZJ1 View Post
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
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post #19 of 32 Old 07-17-2017, 12:12 PM
mkm5
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Originally Posted by kg6mov View Post
A ten year newer vehicle with a completely different suspension tows better than the ZJ? Amazing.
Yes, agreed!


My point being is the ZJ does not inspire any confidence for me whatsoever when towing. I only have to tow for 3 miles on quiet rural roads to get to the lake. I would NOT take that thing on the highway; it does not have the handling or braking to deal with anything other than flat straight roads at modest speeds, let alone if any emergency maneuver or braking is required.
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post #20 of 32 Old 07-17-2017, 12:14 PM
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On another note, though, the ZJ is WAY better off road than the XK, so newer doesn't always mean better!
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post #21 of 32 Old 07-17-2017, 12:21 PM
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You're comparing a vehicle with trailer sway control, larger brakes, IFS, rack-and-pinion steering, longer wheelbase and generally vastly improved handling to a stock(ish) ZJ without trailer sway control. No wonder the XK is better.

A ZJ with trailer sway control, and ie. WJ brake & knuckle swap done, new control arms & track bars all around and rear variable rate coils is a hell of a lot better vehicle to tow compared to a worn stock ZJ. But a ZJ is certainly never gonna be as good as an XK when towing, no matter what you do to it.

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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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post #22 of 32 Old 07-17-2017, 12:32 PM
mkm5
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Quote:
Originally Posted by Timo_90xj View Post
You're comparing a vehicle with trailer sway control, larger brakes, IFS, rack-and-pinion steering, longer wheelbase and generally vastly improved handling to a stock(ish) ZJ without trailer sway control. No wonder the XK is better.

A ZJ with trailer sway control, and ie. WJ brake & knuckle swap done, new control arms & track bars all around and rear variable rate coils is a hell of a lot better vehicle to tow compared to a worn stock ZJ. But a ZJ is certainly never gonna be as good as an XK when towing, no matter what you do to it.

Yes, I'm simply highlighting my observations.

And the ZJ is not worn out at 71,000 miles, nor was the XK at 145,000 miles!
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post #23 of 32 Old 07-17-2017, 12:39 PM
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Aside from the handling standpoint, you think the 4.7 handles towing better than the 5.9? B/c that shouldn't be the case. The 5.9 makes all of its torque at low rpms (thus the low hp) so it should be great for towing. Ive never towed with a 5.9 or a 4.7 so I cant compare. I do know the 5.7 hemi tows mucho grande when compared to the 3/7/4.0 though! No issues holding 75mph with just a simple downshift to 3rd on the hills. My 3.7 kj cant hold 75 when its not towing anything on the same hills.

I would have no issues towing a boat across country with the 5.2/5.9 ZJ. The platform tows great within its limits, given you have good trailer brakes.

1994 ZJ-I6 w/216,000 mi
1998 ZJ 5.9 w/65,155 mi Slate Black
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post #24 of 32 Old 07-17-2017, 12:46 PM
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The engine is not an issue. I would definitely go with what Timo mentioned for any long hauls. The trailer for my '85 Chris Craft Scorpion doesn't have trailer brakes, and I've been towing it for over 20 years with lots of different vehicles for a variety of distances; never had a concern before.

Maybe I'm just getting old!
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post #25 of 32 Old 07-17-2017, 12:53 PM
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Nope, I wouldn't want to tow anything substantial without trailer brakes either. Several states have laws requiring certain weight trailers to have brakes on them. Kentucky doesnt give a crap though, we can tow whatever even if we cant stop.

1994 ZJ-I6 w/216,000 mi
1998 ZJ 5.9 w/65,155 mi Slate Black
2004 KJ w/90,300 mi
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post #26 of 32 Old 07-17-2017, 12:59 PM
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The XK version of the 4.7 is a pretty good motor (unlike the early versions in the WJ), and the 545rfe is gonna kick the **** out of any of the 4Xre or 4Xrh series transmissions.

The 4.7 in the 08 XK puts down 305 hp and 334 lb·ft, the 5.9 does 245 hp and 345 lb·ft, but the first gear in the 545rfe is 3:1 compared to the 46re 2.45:1 both of the 2nd gear ratios in the 545 are deeper than 2nd in the 46re as well. That's gonna make up the difference in torque and then some.


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1984 F250, 460 BB, T19, work truck/future tow pig
1987 Mercedes 300D Turbo, the diesel daily, 30mpg in style

Quote:
Originally Posted by Texas ZJ1 View Post
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
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post #27 of 32 Old 07-17-2017, 01:05 PM
mkm5
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I should add the ZJ tires are 2" taller than stock, and 1" taller than the XK tires, both with 3.73 gears and factory tow package, both in tow mode.

I believe the 545RFE's 2' 2nd gear is what makes the difference in off the line grunt for the XK. It has two different 2nd gears available depending on load and mode, and pulls very strong in 2'.
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post #28 of 32 Old 07-17-2017, 01:08 PM
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Didn't know that 1st gear was so steep in the XK. That and the 2nd gear thing explains why the ZJ isn't as strong off the line!
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post #29 of 32 Old 07-17-2017, 01:14 PM
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Yeah, 46re 2nd is 1.45:1, 545rfe has 1.50:1 and a refreshingly deep 1.67:1 to choose from for "2nd".

You can get aftermarket controllers to control a 545rfe and even add paddle shifters. McCloud really wanted that behind a built 5.9 in his niner. I can see the appeal.


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1984 F250, 460 BB, T19, work truck/future tow pig
1987 Mercedes 300D Turbo, the diesel daily, 30mpg in style

Quote:
Originally Posted by Texas ZJ1 View Post
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
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post #30 of 32 Old 07-17-2017, 01:17 PM
mkm5
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Quote:
Originally Posted by kg6mov View Post
Yeah, 46re 2nd is 1.45:1, 545rfe has 1.50:1 and a refreshingly deep 1.67:1 to choose from for "2nd".

You can get aftermarket controllers to control a 545rfe and even add paddle shifters. McCloud really wanted that behind a built 5.9 in his niner. I can see the appeal.
I was just thinking the same thing! The 545 behind a 5.9 would be awesome!
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