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  1. NickTransmissions

    Turbo350 w/shift kit slamming 2nd gear

    It's up to you but isn't necessary if only doing a service as described in my post above...If you're going to be pulling it you should just overhaul it, esp if it hasn't been gone through before and has more than 100k on it...First drop the pan and see what the fluid and bottom look like...if...
  2. NickTransmissions

    1984 k10 700r4 won't shift out of 2nd please help!

    Re-read the above, particularly your description about what's happening during the 2-3 shift and it does seem like your 3-4 pack is going out...Sometimes it starts out as a flare shift from 2nd to 3rd where RPMs jump for a second or two then 3rd engages at a slightly higher RPM than previous but...
  3. NickTransmissions

    Turbo350 w/shift kit slamming 2nd gear

    If you want to service both accumulators, you'll need to drop the valve body and remove the little 'e' clip holding the 2-3 accumulator in place then compress the spring to install the new piston w/sealing ring...I'd strongly recommend doing so if your trans has a plastic 2-3 accumulator piston...
  4. NickTransmissions

    Turbo350 w/shift kit slamming 2nd gear

    Won't comment on wheel bearings as it's outside the scope of this thread but as far as assuming, it's never a good idea...Always ask your transmission builder exactly what they do to the transmission, even it it means making a checklist and going through line by line. Too many folks assume x...
  5. NickTransmissions

    Turbo350 w/shift kit slamming 2nd gear

    I've done a few GM FWD transmissions, 4T60s and 4T65Es those are fairly straight forward but not touched anything foreign like Hondas, Toyotas etc... Yep, I mentioned that it is very common to see the 1-2 acc spring broken; in fact I replace that spring with a brand new one on all TH350s I...
  6. NickTransmissions

    1984 k10 700r4 won't shift out of 2nd please help!

    What are your line pressure readings at idle, min TV and full TV? If you dont know, find a transmission pressure gauge, hook it in and run the line pressure test. Follow these instructions, let us know the results.
  7. NickTransmissions

    Turbo350 w/shift kit slamming 2nd gear

    Dex/Merc is perfectly fine in the older GM transmissions; Dex6 wouldn't hurt but it's usually not worth it unless racing/super heavy duty towing hauling. Since the fluid is 10 years old, I'd probably change it but Dex6 isn't critical in this case. You also quoted my posts and asked me about...
  8. NickTransmissions

    Turbo350 w/shift kit slamming 2nd gear

    Read post 10 and all my replies afterward. Modulator is irrelevant in this particular case. Doesnt matter in this case
  9. NickTransmissions

    I’m interested in swapping out the TH350 for a 700R4

    Yea, could be (think the 94 Vettes and F-Bodies had OBD2-compliant PCMs installed so hardware integration started earler than 96) but as far as I know, there were no vehicles anywhere manufactured with full OBD2 software, programming and hardware until 1996. But I would be interested to learn...
  10. NickTransmissions

    I’m interested in swapping out the TH350 for a 700R4

    GM started putting ODB2 ports into vehicles in 1995 but didnt switch over to the OBD2 software and programming standard until '96.
  11. NickTransmissions

    I’m interested in swapping out the TH350 for a 700R4

    PWM was introduced in 1995 for the 4L60Es so any ODB-1 TCC/component slipping codes would have applied for that year. Those codes were all two-digit codes without alpha-prefixes. 1993 vettes had 700r4s; they transitioned to 4L60Es in 94.
  12. NickTransmissions

    I’m interested in swapping out the TH350 for a 700R4

    First gear is irrelevant to the mechanical leverage problem at higher throttle angles that can occur in overdrive (4th gear) when paring an overdrive transmission with something like a 2.73 final drive ratio or less. The 3.08 to 1 FD is the tallest ratio that I have seen that still works with...
  13. NickTransmissions

    700R4 Information Thread

    Keep the anchor aside, there's a few valuable parts from it that i can use so can give you a little bit of credit for it towards your build when you're ready..ill let you know if i come into an 88-92 core as well.
  14. NickTransmissions

    700 r4 trans pan ?

    4L60=700R4; GM simply changed the naming convention in the early 90s so yes any 700R4, 4L60 or shallow-pan from a 93-97 4L60E will work on any year 700R4.
  15. NickTransmissions

    700R4 Information Thread

    I can but if it has the 27-spline small-diameter input shaft (82-E84), you have to pay for a later (L84-87) pump and input drum. Both of those parts together are very expensive and hard to find. Count the splines on the input shaft to comfirm/deny... I thought you picked up a 90 or 91 core...
  16. NickTransmissions

    700R4 Information Thread

    Lol! Any 4L60E is going to be better simply owing to the fact you don't have to deal with the throttle valve system found in the 700R4s. But as far as case internals are concerned, the 1988+ 700R4s and 93-96 4L60Es are identical. You don't see any daylight between them until 1997 when GM...
  17. NickTransmissions

    700R4 Information Thread

    Happy New Year, @Royal Sierra 454! Sounds great. For year, look at the case above the servo bore for a large upside down 'U' shaped crease. That indicates a 1988-1993 700R4. 82-87 Lack that crease. Then look at the passenger side rear of the transmission, just above the pan for a...
  18. NickTransmissions

    I’m interested in swapping out the TH350 for a 700R4

    Ok, you're good...One commonly overlooked aspect of doing these swaps is the gear ratio. Many have a very tall a gear ratio and dont upgrade to a deeper one before swapping in the OD trans. They then wonder why the OD trans keeps slipping when trying to accelerate in 4th gear.
  19. NickTransmissions

    I’m interested in swapping out the TH350 for a 700R4

    What's your truck's current final drive ratio?
  20. NickTransmissions

    Turbo350 w/shift kit slamming 2nd gear

    Rick, I'm assuming you meant to type "can't get"with respect to different tension 1-2 acc springs? If so, that is correct to the best of my knowledge
  21. NickTransmissions

    Turbo350 w/shift kit slamming 2nd gear

    Yep, Transgo starts out a good bit smaller in diameter for the 1-2 and 2-3 orifices compared to B&M so folks can 'work up' gradually...I like to direct people new to the process to Transgo's info as it let's them get to their final hole sizing while reducing the likelihood they'll go too far and...
  22. NickTransmissions

    Turbo350 w/shift kit slamming 2nd gear

    Simple - drill the feed holes out.... The art vs science is knowing how much to drill each. You first have to take a variety of factors into consideration (and ill make this specific to the TH350)....They are as follows: 1. Vehicle application 2. Final Drive ratio 3. Converter Stall (perhaps...
  23. NickTransmissions

    Turbo350 w/shift kit slamming 2nd gear

    Compare the instructions for each shift kit as it pertains to clutch feed hole sizes and you'll understand. It may also occur to you why spending money on shift kits for these transmissions is a waste to begin with, especially if you're rebuilding the transmission
  24. NickTransmissions

    Turbo350 w/shift kit slamming 2nd gear

    Nice job, Keith and you're very welcome! Now you know the relationship between that spring and piston and shift feel insofar as the 1-2 shift is concerned in the TH350, and to a great extent, same for the 2-3 and similar in pretty much every other GM transmission that uses a similar...
  25. NickTransmissions

    Turbo350 w/shift kit slamming 2nd gear

    No, sorry - i wasnt referring to you questioning me...i generally advise against leaving the 1-2 acc piston out when converter stall and trans are stock out for two reasons: 1. The delta in shift firmness with it removed is usually too aggressive, esp in a lighter weight vehicle (ie Nova)...

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