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Old 01-12-2019, 08:15 PM   #1 (permalink)
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NV3550 for a medium-duty?

Not sure where exactly to ask this, but I figure the Jeep section would be the best bet for a Jeep transmission.

I've got a Ford motorhome with a 300/4.9 six, that probably needs a new transmission and really wants more gears. The ratios of an NV3550 are perfect, there's a $320 adapter to my bellhousing so I can use stock clutch and mounts, its torque rating of 300ft-lb is well above what my engine makes... so far so good... but what about weight? We're talking 8-10k pounds, and I'd like to have an additional 6k towing capacity (for a "toad"), for a GCWR of 16000lb. Do you think this trans will hold up?

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Old 01-12-2019, 08:22 PM   #2 (permalink)
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Torque is all you need to be concerned with in this example. As long as the engine powering the motor home doesn’t exceed the torque rating of the transmission, you’ll be fine.

Edit: The NV3550 is actually marketed as a medium duty transmission.
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Old 01-12-2019, 09:41 PM   #3 (permalink)
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Theyvare medium duty in the light duty truck work. that does not = medium duty truck trans.

You only find them in jeeps and 1/2t trucks for a reason.

But fuck it. Run it till it dies. Frank is a cripple in a wheelchair but he'll break a steel ball in a rubber room. Some people make a d30 live on 35s, some people blow d60s with 37s.
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Old 01-12-2019, 09:51 PM   #4 (permalink)
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Theyvare medium duty in the light duty truck work. that does not = medium duty truck trans.

You only find them in jeeps and 1/2t trucks for a reason.

But fuck it. Run it till it dies. Frank is a cripple in a wheelchair but he'll break a steel ball in a rubber room. Some people make a d30 live on 35s, some people blow d60s with 37s.
All true. We’ve all witnessed both sides of it. Short story, the transmission will most likely work fine in the motor home.
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Old 01-13-2019, 06:05 AM   #5 (permalink)
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IIRC, from my Chrysler school training, the similar NV3500 has a gross combined weight rating of 7000lbs.
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Old 01-13-2019, 07:46 AM   #6 (permalink)
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Originally Posted by 1968RallySport View Post
Torque is all you need to be concerned with in this example. As long as the engine powering the motor home doesn’t exceed the torque rating of the transmission, you’ll be fine.

Edit: The NV3550 is actually marketed as a medium duty transmission.
Combined weight rating also matters. More load, more time spent at high engine power, more cyclic stress on the internals, and more heat.
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Old 01-13-2019, 05:43 PM   #7 (permalink)
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Quote:
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More load, more time spent at high engine power.
Just to put some context on "high engine power", do you think it matters that my engine peaked at something like 110hp and 220ft-lb torque, when it was new in 1973?
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Old 01-13-2019, 07:21 PM   #8 (permalink)
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Just to put some context on "high engine power", do you think it matters that my engine peaked at something like 110hp and 220ft-lb torque, when it was new in 1973?
It will probably work for you long enough for you to get sick of 16k behind 110hp... I have no data for how much continuous power it can take. If you can cool it somehow it would help. I know there are extended pto covers with cooling fins for the nv4500...
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Old 01-13-2019, 07:58 PM   #9 (permalink)
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I think its canton, makes a external electric heavy oil pump that could be bunged into the pto cover/fill plugs.

Put it on a ign hot relay setup to a med sixed cooler. Might last a little longer.
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Old 01-13-2019, 08:17 PM   #10 (permalink)
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*tilton

I used one of these on a d20 to keep it from starving while being flat towed


https://www.summitracing.com/parts/til-40-524/
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Old 01-28-2019, 09:45 PM   #11 (permalink)
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It will probably work for you long enough for you to get sick of 16k behind 110hp...
Yeah, it wants a 6BD badly, but that's a pipe dream at this point. FWIW, it feels surprisingly adequate at current weight of ~7k lb.

Turns out the AX15 shares a boltpattern. Looking into whether it shares the rest. Thoughts on its durability?
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Old 01-28-2019, 09:48 PM   #12 (permalink)
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Again, what kind of veh do you find ax in?
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Old 01-30-2019, 03:29 PM   #13 (permalink)
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Again, what kind of veh do you find ax in?
The kind of vehicles that are often modified and driven well beyond their original designs, and which have a user base that over the years has accumulated knowledge of what parts can be overloaded, and which are barely adequate for stock.

My 81 Yota was rated for 28" tires. Consensus seems to be that front axles can handle up to 33", and the rears are good for at least 38". Its stock L or G transmission can't handle a 181ft-lb OM617 for long, while the R trans (same as AX15 apparently) that came in very similar vehicles seems good for at least 300, and depending on how similar it is to the Supra's R154, double that.

Ratings have a fuzzy relationship with reality. Sometimes over, often under.
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Old 01-30-2019, 04:02 PM   #14 (permalink)
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And ax15 are know to be decent for stock-mild jeeps and their short comings are well versed.

Stop looking for trans that come in 1/4t vehicles when you have a 1t truck.

Would you put a t90 behing a sbc in a drw truck? I sure the hell wouldnt. 283 t90d18 in a cj2, sure, still wouldnt expect it to last very long if it was a built and wheeled veh.

He has a rig that is 7000lbs, its gona take that small trans and turn it into bass boat paint job.
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Old 01-30-2019, 04:33 PM   #15 (permalink)
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Quote:
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Stop looking for trans that come in 1/2t vehicles when you have a 2t truck.
FTFY, but your point stands and I'm taking your opinion into consideration. I'd certainly prefer a trans that was designed for the application, but not finding any that will fit without custom fab work and have good gearing. The 50% drop between 1-2 and 2-3 on mine is ridiculous. NV4500 is almost as bad.
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Old 01-30-2019, 07:12 PM   #16 (permalink)
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What bolt pattern do the food 300s use? Sbf?

What about a zf small pattern?
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Old 02-23-2019, 11:20 PM   #17 (permalink)
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Yep, same as SBF V8.

The ZF would be an easy choice, but while the diesel and BBF versions had normal slave cylinders, the SBF slaves are internal and that is a dealbreaker. Unfortunately, the bellhousings cannot be swapped.

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Old 02-24-2019, 09:04 AM   #18 (permalink)
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having never had a slave die before a clutch that would not be a deal breaker for me.
the 3550 is a bad idea for a motorhome.
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Old 02-24-2019, 02:32 PM   #19 (permalink)
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YMMV; I think at least half of all no-warning part failures I've had on any of my rigs have been clutch slaves. I can think of five just off the bat - two Toyotas, a Mitsubishi, a Ford, and a Peugeot. Internal slave is just idiotic, and this particular one has a reputation for trouble.

A lesser problem is that the ZF's bellhousing doesn't have mounts on it like my NP435.
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Old 02-24-2019, 02:50 PM   #20 (permalink)
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the 3550 is a bad idea for a motorhome.
Ax-15 is worse imo. I’d want a truck trans, not a 1/4 ton suv trans.

Nv4500, zf5, zf6.
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Old 02-24-2019, 03:09 PM   #21 (permalink)
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Is there a Clark or NP 5-speed (direct 5th) that could bolt to that bell? That gives you the extra gear step and should be bulletproof.

I'd sooner try to make the ZF5 work than play with lesser trans in that heavy a rig.
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Old 02-24-2019, 07:41 PM   #22 (permalink)
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Is there a Clark or NP 5-speed (direct 5th) that could bolt to that bell? That gives you the extra gear step and should be bulletproof.

I'd sooner try to make the ZF5 work than play with lesser trans in that heavy a rig.
the ford close ratio zf5-s42 match almost identical to his nv3550 choice, in a bolt in HD package
S5-42 Close Ratio 4.14 2.37 1.42 1.00 0.77 and rev 3.79 : 1
nv3550 by novak 4.01 2.33 1.39 1.00 0.78 and Rev 3.57
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Old 02-24-2019, 07:44 PM   #23 (permalink)
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YMMV; I think at least half of all no-warning part failures I've had on any of my rigs have been clutch slaves. I can think of five just off the bat - two Toyotas, a Mitsubishi, a Ford, and a Peugeot. Internal slave is just idiotic, and this particular one has a reputation for trouble.
a lot of these 'no warning' slave failures are at the end of the life of a diaghram clutch when it gets stiffer then the plastic slave can handle.

I guess anyone that would own a Peugeot would consider a 3550 in a motorhome as a viable choice
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Old 02-24-2019, 07:50 PM   #24 (permalink)
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having never had a slave die before a clutch that would not be a deal breaker for me.
I saw a lot of failures in the late 80s. Always in yj’s. Failed clutch and a puddle under the jeep.
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Old 02-25-2019, 03:44 PM   #25 (permalink)
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Quote:
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a lot of these 'no warning' slave failures are at the end of the life of a diaghram clutch when it gets stiffer then the plastic slave can handle.

I guess anyone that would own a Peugeot would consider a 3550 in a motorhome as a viable choice
These were metal slaves, not plastic. In at least one case, the clutch was about a year old.

Have you ever worked on an older Peugeot? Have you seen the masses of 504 that in much of Africa and Asia are the passenger car equal to the Hilux? Do you know WTF you're talking about? Or is that from the same bucket as "anything less than a V8 for a stock Yota is stupid?"

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