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Old 02-03-2018, 09:49 PM   #1
DKindley
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Default 727 upshift mystery

Hello Gentlemen its been a while since I posted up. You guys were such a big help that my scout has been running great for a while. New issue though I'm hoping someone can help me with. So for a little back story my teenage boys have been taking turns daily driving my 75 SII to school for the last couple years. Suddenly they came home saying the scout is making noises. Long story short, they were doing nuetral drops to spin the tires!! I know right. We tore it apart and the sprag was toast and the cluthes were all shot. We completely rebuilt it with new bolt in sprag, and a shift kit. Put it back together and test drove it.
Problem is now it will stay in 1st gear when the throttle is applied. If i let off the throttle and coast it will shift into 2nd and direct. But once its in 2 and 3 it slips. Any ideas? I'm suspecting the governor circuit, but it does go into 2-3 when coasting?
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Old 02-03-2018, 10:01 PM   #2
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Default Re: 727 upshift mystery

Just for clarification, I've tried the following:

Warmed it up, checked fluid idling in nuetral- at full mark
Adjusted the kickdown linkage- 1/4" gap at idle, 1/16" left on
shaft at WOT per MR. Mayben's previous posts
I used the Munroe book by the letter when I rebuilt it, so I know the bands are correct. Torqued to 72 in lbs, backed off 2 1/4 turns on the kickdown band and 2 turns on the low/reverse band
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Old 02-04-2018, 10:14 PM   #3
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Default Re: 727 upshift mystery

Seems like Iíve stumped everyone? Hereís my plan of attack, let me know if itís a good one. Iíll hook up a gauge to the governor port and test pressure. If that checks out Iím going to pull the valve body and check all the valves to see if one is sticking. I feel like I just donít have enough line pressure to lock the clutches in 2 and 3? If anyone has a better suggestion please let me know.
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Old 02-05-2018, 06:34 PM   #4
Scoutboy74
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Default Re: 727 upshift mystery

Did you bench test with compressed air applied to the assorted ports to make sure servos and clutches were applying/releasing properly?
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Coal Trickle - '99 Dodge Ram 2500 Q-Cab SWB 4x4 - 5.9L 24V CTD/NV4500
Hooty - '74 SII - 392/TF727/D20/3.73 D44's/Spartan FA/Krac-lok RA/RC 4" SUA/34x10.5 TSLs/33g Fuel/HFT 8k winch
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Old 02-05-2018, 07:22 PM   #5
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Default Re: 727 upshift mystery

Scoutboy, thanks for replying I thought maybe I scared everyone off. Yes I did air check the clutch packs and I could hear them popping closed. The servo ports moved the servos also. I was re-reading the shift kit instructions and I did fail to replace an oem spring with a kit spring. I seriously doubt thatís the issue though.
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Old 02-05-2018, 07:56 PM   #6
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Default Re: 727 upshift mystery

Not skerrd. Just didn't see this until a little bit ago. I don't think there are that many active members who've had their hands inside a slushbox lurking about here either. Will this trans downshift from direct to 2nd when you goose it at say 40 mph? Does manually bumping the lever up from 1-2-D as you accelerate make any difference?
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Coal Trickle - '99 Dodge Ram 2500 Q-Cab SWB 4x4 - 5.9L 24V CTD/NV4500
Hooty - '74 SII - 392/TF727/D20/3.73 D44's/Spartan FA/Krac-lok RA/RC 4" SUA/34x10.5 TSLs/33g Fuel/HFT 8k winch
Mongo - '71 1210 Std Cab 2WD - 345/TF727/RA17 D60 4.10 Trac-lok - "Mongo love candy! Duh, huh, huh!"
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