E361T Brockway - 4.10's to 3.70's

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E361T Brockway - 4.10's to 3.70's

Postby oldspwr » Thu Oct 03, 2019 4:04 pm

Well it has been a pretty good summer for truck shows and the new 671 works really well. I went to Macungie, Honesdale, Cortland and finally our Harford show...

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Now that I’m comfortable with the install I decided it was time to make a gear change. The truck was originally ordered with 4.10 gears and when I found the Neway air ride cutoff it also had 4.10 gears. With the 4.10 gears and 40.5” tall tires, I was right at 2200 rpm at 64mph or so. Since I want to have little room to breathe and get around somebody, I figured it would make sense to put a little taller gears in it.

I had asked a question on the Detroit group on FB about what the best cruising rpm is for a 2 stroke and received a ton of responses, from ‘slam your hand in the door’ nonsense to ‘keep it up tight against the governor at all times’. I finally received a couple of practical answers, including answers from Stan A and Joe D. They agreed that anywhere between 1900-2000 was a good cruising rpm for this motor.

I put a spreadsheet together and started running the numbers on the different ratios available for the Eaton 23105S rear, including the original 4.10’s, 3.90’s, 3.70’s and 3.58’s. After looking at the numbers I decided on 3.70’s which would put me right at 2000 rpm at 65 mph. I realize some guys like to run faster than that, but 65mph is a good speed for me. At that time I started looking for a pumpkin and wound up finding one at Global Truck Parts in Archbald, PA, not too far from home.

The rear came out of a Freightliner that supposedly had less that 200k miles on it and still had ‘shiny’ black paint. I was only interested in the pumpkin but it was a package deal so I took the entire housing...

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I used the forklift to unload it and then tucked it in the garage to drain all the oil out of it and strip it down...

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Once the oil was out of it I took it back outside and used a cup wire brush to clean it up...

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After it was good and clean I used the cherry picker to pull the pumpkin from the housing and bring it back in the garage...

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More to follow...
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Re: E361T Brockway - 4.10's to 3.70's

Postby oldspwr » Thu Oct 03, 2019 4:05 pm

If you remember I wound up having to change the yoke on the original rear to go from 1810 series joints to 1710 series. Well this rear came with a 1760 series joint yoke so I planned on using the one from the 4.10’s. I was able to dig up the 1710 part number (6-4-9181-1X) and sure enough I found one on eBay. So I made an offer I was sure they were going to refuse and they wound up accepting it!!! I also found a brand new pinion seal on eBay for less than half of new so I bought that also.

With the new parts on their way, I set the rear up on a stand my Dad and I made when we rebuilt the 2 speed Eaton for the 155W. On a side note, can anyone guess what is in the wood box with the deluxe rubber tires???

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Then I punch marked all the adjustment nuts for reference, measured the back lash, and then took everything apart...

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And within a few hours I had everything stripped, cleaned, washed and ready to be reassembled. Fortunately all the bearings were either Timken or and made in the USA, and it very good condition.

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Once the housing was empty, I took it outside and cleaned both the inside (and outside again) with the wire brush...

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More to follow...
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Re: E361T Brockway - 4.10's to 3.70's

Postby Huskiedrive2 » Fri Oct 04, 2019 3:51 pm

Nice work Tom. 3.70 on 20" rubber is a good choice.
As for the crate on deluxe rubber wheels, I'd guess a Sheppard power steering box. It's the only thing I can think of that's really heavy in that small of a crate.
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Re: E361T Brockway - 4.10's to 3.70's

Postby oldspwr » Tue Oct 08, 2019 5:45 am

Hi Stan, you are correct! I made the wood box when I shipped my Sheppard 592 box back to the factory in Hanover to be gone through. My Brother showed up one day with the wheels from an old hose reel and I thought they would make it a alot easier to move around the garage. More updates to follow...

Tom
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Re: E361T Brockway - 4.10's to 3.70's

Postby stubnosebrock » Wed Oct 09, 2019 2:16 pm

I agree, 3.70 sounds about right. If you wanted more road speed or lower RPM more, id consider an overdrive before more rear gear. My Huskirdrive truck would do around 72mph if I remember right, in direct, with 22.5s
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Re: E361T Brockway - 4.10's to 3.70's

Postby oldspwr » Fri Oct 11, 2019 9:45 am

Thanks guys... here are a few more updates...

Once everything was good and clean I started reassembling everything...

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And I had to find some creative ways to torque the bolts in the carrier...

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Then I dug out a piece of 1 1/2" square stock I had used for the 2 speed, and used this to set the carrier back in the housing...

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Once I was done with the carrier, I moved back to the pinion support. After I reassembled it I checked the pinion preload and realized I it was too loose. Per the manual, I was using the press method with a spring scale to check the preload instead of installing the yoke and tightening it up every time...

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More to follow...
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Re: E361T Brockway - 4.10's to 3.70's

Postby oldspwr » Fri Oct 11, 2019 9:46 am

To get the preload correct I had to take several thousandths off of the bearing spacer. The space was a little of a half an inch thick to start with.

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Once I was happy with the preload I made a seal installer from a piece of wood...

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And then I took a 4” wide piece of 3/16” flat stock and drilled holes to mount the new 1710 yoke in it. I actually used the other side of the one I made for the 2 speed. This would allow me to bolt the pinion in the vice and torque the pinion nut (830 ft lbs)

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I was able to recruit Tommy this time to help me torque the pinion nut. It’s hard to see in the pic, but I tied a 2” strap around the pinion cage and the vice, just in case the vice broke. If the pinion hit the concrete it would not be good!!!

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More to follow...
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Re: E361T Brockway - 4.10's to 3.70's

Postby oldspwr » Fri Oct 11, 2019 9:47 am

I installed the pinion cage and then reset the gears to exactly where they were before I disassembled everything. I made several small changes, double checked the pattern and made sure the back lash was very close to where it was...

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Once I was comfortable with everything, I taped it up and took it outside to paint it, along with the Saginaw steering box for my Brother’s 81 pickup...

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I usually wait a week after I paint anything before I install it, so I decided to chase another problem I had. I originally had temp gauges for both the rear and trans. Both gauges started at 140 degrees and never moved. I wound up buying two regular oil temperature gauges that started at 100 degrees. The trans would get up to 150-160 deg or so but the rear would never move. Using a meter I realized the rear was not really grounded well. Without a good ground, the gauge would not get the correct resistance reading from the sending unit. So I would up buying a ground bar clamp from the hardware store. I had to file the one side so that it would clamp well around the bushing for the sending unit. Then I ran a wire from the ground bar clamp directly to the frame...

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This did the trick... I took the truck for a good ride (with the 4.10’s) and the gauge climbed just a little over 120 deg. I wanted to have a basis of comparison for when I changed the gears. The trans is on the left and the rear is on the right...

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That's it for now...
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Re: E361T Brockway - 4.10's to 3.70's

Postby Huskiedrive2 » Fri Oct 11, 2019 6:10 pm

Very good Tom! If you want to see those gauges climb, hook onto one of Joe D's trailers and pull a load somewhere. If you get some resistance instead of free rolling, the rear (and tranny) will make some real heat!
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